ForecasterDirectMultiVariate

skforecast.direct._forecaster_direct_multivariate.ForecasterDirectMultiVariate

ForecasterDirectMultiVariate(
    regressor,
    level,
    steps,
    lags=None,
    window_features=None,
    transformer_series=StandardScaler(),
    transformer_exog=None,
    weight_func=None,
    differentiation=None,
    fit_kwargs=None,
    binner_kwargs=None,
    n_jobs="auto",
    forecaster_id=None,
)

Bases: ForecasterBase

This class turns any regressor compatible with the scikit-learn API into a autoregressive multivariate direct multi-step forecaster. A separate model is created for each forecast time step. See documentation for more details.

Parameters:

Name	Type	Description	Default
regressor	regressor or pipeline compatible with the scikit-learn API	An instance of a regressor or pipeline compatible with the scikit-learn API.	required
level	str	Name of the time series to be predicted.	required
steps	int	Maximum number of future steps the forecaster will predict when using method predict(). Since a different model is created for each step, this value must be defined before training.	required
lags	int, list, numpy ndarray, range, dict	Lags used as predictors. Index starts at 1, so lag 1 is equal to t-1. int: include lags from 1 to lags (included). list, 1d numpy ndarray or range: include only lags present in lags, all elements must be int. dict: create different lags for each series. {'series_column_name': lags}. None: no lags are included as predictors.	None
window_features	(object, list)	Instance or list of instances used to create window features. Window features are created from the original time series and are included as predictors.	None
transformer_series	(transformer(preprocessor), dict)	An instance of a transformer (preprocessor) compatible with the scikit-learn preprocessing API with methods: fit, transform, fit_transform and inverse_transform. Transformation is applied to each series before training the forecaster. ColumnTransformers are not allowed since they do not have inverse_transform method. If single transformer: it is cloned and applied to all series. If dict of transformers: a different transformer can be used for each series.	`sklearn.preprocessing.StandardScaler`
transformer_exog	transformer	An instance of a transformer (preprocessor) compatible with the scikit-learn preprocessing API. The transformation is applied to exog before training the forecaster. inverse_transform is not available when using ColumnTransformers.	None
weight_func	Callable	Function that defines the individual weights for each sample based on the index. For example, a function that assigns a lower weight to certain dates. Ignored if regressor does not have the argument sample_weight in its fit method. The resulting sample_weight cannot have negative values.	None
differentiation	int	Order of differencing applied to the time series before training the forecaster. If None, no differencing is applied. The order of differentiation is the number of times the differencing operation is applied to a time series. Differencing involves computing the differences between consecutive data points in the series. Before returning a prediction, the differencing operation is reversed.	None
fit_kwargs	dict	Additional arguments to be passed to the fit method of the regressor.	None
binner_kwargs	dict	Additional arguments to pass to the QuantileBinner used to discretize the residuals into k bins according to the predicted values associated with each residual. Available arguments are: n_bins, method, subsample, random_state and dtype. Argument method is passed internally to the function numpy.percentile. New in version 0.15.0	None
n_jobs	(int, 'auto')	The number of jobs to run in parallel. If -1, then the number of jobs is set to the number of cores. If 'auto', n_jobs is set using the function skforecast.utils.select_n_jobs_fit_forecaster.	'auto'
forecaster_id	(str, int)	Name used as an identifier of the forecaster.	None

Attributes:

Name	Type	Description
regressor	regressor or pipeline compatible with the scikit-learn API	An instance of a regressor or pipeline compatible with the scikit-learn API. An instance of this regressor is trained for each step. All of them are stored in self.regressors_.
regressors_	dict	Dictionary with regressors trained for each step. They are initialized as a copy of regressor.
steps	int	Number of future steps the forecaster will predict when using method predict(). Since a different model is created for each step, this value should be defined before training.
lags	numpy ndarray, dict	Lags used as predictors.
lags_	dict	Dictionary with the lags of each series. Created from lags when creating the training matrices and used internally to avoid overwriting.
lags_names	dict	Names of the lags of each series.
max_lag	int	Maximum lag included in lags.
window_features	list	Class or list of classes used to create window features.
window_features_names	list	Names of the window features to be included in the X_train matrix.
window_features_class_names	list	Names of the classes used to create the window features.
max_size_window_features	int	Maximum window size required by the window features.
window_size	int	The window size needed to create the predictors. It is calculated as the maximum value between max_lag and max_size_window_features. If differentiation is used, window_size is increased by n units equal to the order of differentiation so that predictors can be generated correctly.
transformer_series	transformer (preprocessor), dict, default None	An instance of a transformer (preprocessor) compatible with the scikit-learn preprocessing API with methods: fit, transform, fit_transform and inverse_transform. Transformation is applied to each series before training the forecaster. ColumnTransformers are not allowed since they do not have inverse_transform method. If single transformer: it is cloned and applied to all series. If dict of transformers: a different transformer can be used for each series.
transformer_series_	dict	Dictionary with the transformer for each series. It is created cloning the objects in transformer_series and is used internally to avoid overwriting.
transformer_exog	transformer	An instance of a transformer (preprocessor) compatible with the scikit-learn preprocessing API. The transformation is applied to exog before training the forecaster. inverse_transform is not available when using ColumnTransformers.
weight_func	Callable	Function that defines the individual weights for each sample based on the index. For example, a function that assigns a lower weight to certain dates. Ignored if regressor does not have the argument sample_weight in its fit method. The resulting sample_weight cannot have negative values.
source_code_weight_func	str	Source code of the custom function used to create weights.
differentiation	int	Order of differencing applied to the time series before training the forecaster.
differentiation_max	int	Maximum order of differentiation. For this Forecaster, it is equal to the value of the differentiation parameter.
differentiator	TimeSeriesDifferentiator	Skforecast object used to differentiate the time series.
differentiator_	dict	Dictionary with the differentiator for each series. It is created cloning the objects in differentiator and is used internally to avoid overwriting.
last_window_	pandas DataFrame	This window represents the most recent data observed by the predictor during its training phase. It contains the values needed to predict the next step immediately after the training data. These values are stored in the original scale of the time series before undergoing any transformations or differentiation. When differentiation parameter is specified, the dimensions of the last_window_ are expanded as many values as the order of differentiation. For example, if lags = 7 and differentiation = 1, last_window_ will have 8 values.
index_type_	type	Type of index of the input used in training.
index_freq_	str	Frequency of Index of the input used in training.
training_range_	pandas Index	First and last values of index of the data used during training.
exog_in_	bool	If the forecaster has been trained using exogenous variable/s.
exog_type_in_	type	Type of exogenous variable/s used in training.
exog_dtypes_in_	dict	Type of each exogenous variable/s used in training. If transformer_exog is used, the dtypes are calculated after the transformation.
exog_names_in_	list	Names of the exogenous variables used during training.
series_names_in_	list	Names of the series used during training.
X_train_series_names_in_	list	Names of the series added to X_train when creating the training matrices with _create_train_X_y method. It is a subset of series_names_in_.
X_train_window_features_names_out_	list	Names of the window features included in the matrix X_train created internally for training.
X_train_exog_names_out_	list	Names of the exogenous variables included in the matrix X_train created internally for training. It can be different from exog_names_in_ if some exogenous variables are transformed during the training process.
X_train_direct_exog_names_out_	list	Same as X_train_exog_names_out_ but using the direct format. The same exogenous variable is repeated for each step.
X_train_features_names_out_	list	Names of columns of the matrix created internally for training.
fit_kwargs	dict	Additional arguments to be passed to the fit method of the regressor.
in_sample_residuals_	dict	Residuals of the model when predicting training data. Only stored up to 10_000 values per step in the form {step: residuals}. If transformer_series is not None, residuals are stored in the transformed scale. If differentiation is not None, residuals are stored after differentiation.
in_sample_residuals_by_bin_	dict	In sample residuals binned according to the predicted value each residual is associated with. The number of residuals stored per bin is limited to 10_000 // self.binner.n_bins_ in the form {bin: residuals}. If transformer_series is not None, residuals are stored in the transformed scale. If differentiation is not None, residuals are stored after differentiation. New in version 0.15.0
out_sample_residuals_	dict	Residuals of the model when predicting non-training data. Only stored up to 10_000 values per step in the form {step: residuals}. Use set_out_sample_residuals() method to set values. If transformer_series is not None, residuals are stored in the transformed scale. If differentiation is not None, residuals are stored after differentiation.
out_sample_residuals_by_bin_	dict	Out of sample residuals binned according to the predicted value each residual is associated with. The number of residuals stored per bin is limited to 10_000 // self.binner.n_bins_ in the form {bin: residuals}. If transformer_series is not None, residuals are stored in the transformed scale. If differentiation is not None, residuals are stored after differentiation. New in version 0.15.0
binner	QuantileBinner	QuantileBinner used to discretize residuals into k bins according to the predicted values associated with each residual. New in version 0.15.0
binner_intervals_	dict	Intervals used to discretize residuals into k bins according to the predicted values associated with each residual. New in version 0.15.0
binner_kwargs	dict	Additional arguments to pass to the QuantileBinner. New in version 0.15.0
creation_date	str	Date of creation.
is_fitted	bool	Tag to identify if the regressor has been fitted (trained).
fit_date	str	Date of last fit.
skforecast_version	str	Version of skforecast library used to create the forecaster.
python_version	str	Version of python used to create the forecaster.
n_jobs	(int, 'auto')	The number of jobs to run in parallel. If -1, then the number of jobs is set to the number of cores. If 'auto', n_jobs is set using the function skforecast.utils.select_n_jobs_fit_forecaster.
forecaster_id	(str, int)	Name used as an identifier of the forecaster.
_probabilistic_mode	(str, bool)	Private attribute used to indicate whether the forecaster should perform some calculations during backtesting.
dropna_from_series	Ignored	Not used, present here for API consistency by convention.
encoding	Ignored	Not used, present here for API consistency by convention.

Notes

A separate model is created for each forecasting time step. It is important to note that all models share the same parameter and hyperparameter configuration.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def __init__(
    self,
    regressor: object,
    level: str,
    steps: int,
    lags: int | list[int] | np.ndarray[int] | range[int] | dict[str, int | list] | None = None,
    window_features: object | list[object] | None = None,
    transformer_series: object | dict[str, object] | None = StandardScaler(),
    transformer_exog: object | None = None,
    weight_func: Callable | None = None,
    differentiation: int | None = None,
    fit_kwargs: dict[str, object] | None = None,
    binner_kwargs: dict[str, object] | None = None,
    n_jobs: int | str = 'auto',
    forecaster_id: str | int | None = None
) -> None:

    self.regressor                          = copy(regressor)
    self.level                              = level
    self.steps                              = steps
    self.lags_                              = None
    self.transformer_series                 = transformer_series
    self.transformer_series_                = None
    self.transformer_exog                   = transformer_exog
    self.weight_func                        = weight_func
    self.source_code_weight_func            = None
    self.differentiation                    = differentiation
    self.differentiation_max                = None
    self.differentiator                     = None
    self.differentiator_                    = None
    self.last_window_                       = None
    self.index_type_                        = None
    self.index_freq_                        = None
    self.training_range_                    = None
    self.series_names_in_                   = None
    self.exog_in_                           = False
    self.exog_names_in_                     = None
    self.exog_type_in_                      = None
    self.exog_dtypes_in_                    = None
    self.X_train_series_names_in_           = None
    self.X_train_window_features_names_out_ = None
    self.X_train_exog_names_out_            = None
    self.X_train_direct_exog_names_out_     = None
    self.X_train_features_names_out_        = None
    self.in_sample_residuals_               = None
    self.out_sample_residuals_              = None
    self.in_sample_residuals_by_bin_        = None
    self.out_sample_residuals_by_bin_       = None
    self.creation_date                      = pd.Timestamp.today().strftime('%Y-%m-%d %H:%M:%S')
    self.is_fitted                          = False
    self.fit_date                           = None
    self.skforecast_version                 = skforecast.__version__
    self.python_version                     = sys.version.split(" ")[0]
    self.forecaster_id                      = forecaster_id
    self._probabilistic_mode                = "binned"
    self.dropna_from_series                 = False  # Ignored in this forecaster
    self.encoding                           = None   # Ignored in this forecaster

    if not isinstance(level, str):
        raise TypeError(
            f"`level` argument must be a str. Got {type(level)}."
        )

    if not isinstance(steps, int):
        raise TypeError(
            f"`steps` argument must be an int greater than or equal to 1. "
            f"Got {type(steps)}."
        )

    if steps < 1:
        raise ValueError(
            f"`steps` argument must be greater than or equal to 1. Got {steps}."
        )

    self.regressors_ = {step: clone(self.regressor) for step in range(1, steps + 1)}

    if isinstance(lags, dict):
        self.lags = {}
        self.lags_names = {}
        list_max_lags = []
        for key in lags:
            if lags[key] is None:
                self.lags[key] = None
                self.lags_names[key] = None
            else:
                self.lags[key], lags_names, max_lag = initialize_lags(
                    forecaster_name = type(self).__name__,
                    lags            = lags[key]
                )
                self.lags_names[key] = (
                    [f'{key}_{lag}' for lag in lags_names] 
                     if lags_names is not None 
                     else None
                )
                if max_lag is not None:
                    list_max_lags.append(max_lag)

        self.max_lag = max(list_max_lags) if len(list_max_lags) != 0 else None
    else:
        self.lags, self.lags_names, self.max_lag = initialize_lags(
            forecaster_name = type(self).__name__, 
            lags            = lags
        )

    self.window_features, self.window_features_names, self.max_size_window_features = (
        initialize_window_features(window_features)
    )
    if self.window_features is None and (self.lags is None or self.max_lag is None):
        raise ValueError(
            "At least one of the arguments `lags` or `window_features` "
            "must be different from None. This is required to create the "
            "predictors used in training the forecaster."
        )

    self.window_size = max(
        [ws for ws in [self.max_lag, self.max_size_window_features] 
         if ws is not None]
    )
    self.window_features_class_names = None
    if window_features is not None:
        self.window_features_class_names = [
            type(wf).__name__ for wf in self.window_features
        ]

    self.in_sample_residuals_ = {step: None for step in range(1, steps + 1)}

    self.weight_func, self.source_code_weight_func, _ = initialize_weights(
        forecaster_name = type(self).__name__, 
        regressor       = regressor, 
        weight_func     = weight_func, 
        series_weights  = None
    )

    if differentiation is not None:
        if not isinstance(differentiation, int) or differentiation < 1:
            raise ValueError(
                f"Argument `differentiation` must be an integer equal to or "
                f"greater than 1. Got {differentiation}."
            )
        self.differentiation = differentiation
        self.differentiation_max = differentiation
        self.window_size += differentiation
        self.differentiator = TimeSeriesDifferentiator(
            order=differentiation, window_size=self.window_size
        )

    self.fit_kwargs = check_select_fit_kwargs(
                          regressor  = regressor,
                          fit_kwargs = fit_kwargs
                      )

    self.binner_kwargs = binner_kwargs
    if binner_kwargs is None:
        self.binner_kwargs = {
            'n_bins': 10, 'method': 'linear', 'subsample': 200000,
            'random_state': 789654, 'dtype': np.float64
        }
    self.binner = QuantileBinner(**self.binner_kwargs)
    self.binner_intervals_ = None

    if n_jobs == 'auto':
        self.n_jobs = select_n_jobs_fit_forecaster(
                          forecaster_name = type(self).__name__,
                          regressor       = self.regressor
                      )
    else:
        if not isinstance(n_jobs, int):
            raise TypeError(
                f"`n_jobs` must be an integer or `'auto'`. Got {type(n_jobs)}."
            )
        self.n_jobs = n_jobs if n_jobs > 0 else cpu_count()

_repr_html_

_repr_html_()

HTML representation of the object. The "General Information" section is expanded by default.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _repr_html_(self):
    """
    HTML representation of the object.
    The "General Information" section is expanded by default.
    """

    (
        params,
        _,
        series_names_in_,
        exog_names_in_,
        transformer_series,
    ) = self._preprocess_repr(
            regressor          = self.regressor,
            series_names_in_   = self.series_names_in_,
            exog_names_in_     = self.exog_names_in_,
            transformer_series = self.transformer_series,
        )

    style, unique_id = get_style_repr_html(self.is_fitted)

    content = f"""
    <div class="container-{unique_id}">
        <h2>{type(self).__name__}</h2>
        <details open>
            <summary>General Information</summary>
            <ul>
                <li><strong>Regressor:</strong> {type(self.regressor).__name__}</li>
                <li><strong>Target series (level):</strong> {self.level}</li>
                <li><strong>Lags:</strong> {self.lags}</li>
                <li><strong>Window features:</strong> {self.window_features_names}</li>
                <li><strong>Window size:</strong> {self.window_size}</li>
                <li><strong>Maximum steps to predict:</strong> {self.steps}</li>
                <li><strong>Exogenous included:</strong> {self.exog_in_}</li>
                <li><strong>Weight function included:</strong> {self.weight_func is not None}</li>
                <li><strong>Differentiation order:</strong> {self.differentiation}</li>
                <li><strong>Creation date:</strong> {self.creation_date}</li>
                <li><strong>Last fit date:</strong> {self.fit_date}</li>
                <li><strong>Skforecast version:</strong> {self.skforecast_version}</li>
                <li><strong>Python version:</strong> {self.python_version}</li>
                <li><strong>Forecaster id:</strong> {self.forecaster_id}</li>
            </ul>
        </details>
        <details>
            <summary>Exogenous Variables</summary>
            <ul>
                {exog_names_in_}
            </ul>
        </details>
        <details>
            <summary>Data Transformations</summary>
            <ul>
                <li><strong>Transformer for series:</strong> {transformer_series}</li>
                <li><strong>Transformer for exog:</strong> {self.transformer_exog}</li>
            </ul>
        </details>
        <details>
            <summary>Training Information</summary>
            <ul>
                <li><strong>Target series (level):</strong> {self.level}</li>
                <li><strong>Multivariate series:</strong> {series_names_in_}</li>
                <li><strong>Training range:</strong> {self.training_range_.to_list() if self.is_fitted else 'Not fitted'}</li>
                <li><strong>Training index type:</strong> {str(self.index_type_).split('.')[-1][:-2] if self.is_fitted else 'Not fitted'}</li>
                <li><strong>Training index frequency:</strong> {self.index_freq_ if self.is_fitted else 'Not fitted'}</li>
            </ul>
        </details>
        <details>
            <summary>Regressor Parameters</summary>
            <ul>
                {params}
            </ul>
        </details>
        <details>
            <summary>Fit Kwargs</summary>
            <ul>
                {self.fit_kwargs}
            </ul>
        </details>
        <p>
            <a href="https://skforecast.org/{skforecast.__version__}/api/forecasterdirectmultivariate.html">&#128712 <strong>API Reference</strong></a>
            &nbsp;&nbsp;
            <a href="https://skforecast.org/{skforecast.__version__}/user_guides/dependent-multi-series-multivariate-forecasting.html">&#128462 <strong>User Guide</strong></a>
        </p>
    </div>
    """

    # Return the combined style and content
    return style + content

_create_data_to_return_dict

_create_data_to_return_dict(series_names_in_)

Create data_to_return_dict based on series names and lags configuration. The dictionary contains the information to decide what data to return in the _create_lags method.

Parameters:

Name	Type	Description	Default
series_names_in_	list	Names of the series used during training.	required

Returns:

Name	Type	Description
data_to_return_dict	dict	Dictionary with the information to decide what data to return in the _create_lags method. Options are 'X', 'y' or 'both'.
X_train_series_names_in_	list	Names of the series added to X_train when creating the training matrices with _create_train_X_y method. It is a subset of series_names_in_.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _create_data_to_return_dict(
    self, 
    series_names_in_: list[str]
) -> tuple[dict[str, str], list[str]]:
    """
    Create `data_to_return_dict` based on series names and lags configuration.
    The dictionary contains the information to decide what data to return in 
    the `_create_lags` method.

    Parameters
    ----------
    series_names_in_ : list
        Names of the series used during training.

    Returns
    -------
    data_to_return_dict : dict
        Dictionary with the information to decide what data to return in the
        `_create_lags` method. Options are 'X', 'y' or 'both'.
    X_train_series_names_in_ : list
        Names of the series added to `X_train` when creating the training
        matrices with `_create_train_X_y` method. It is a subset of 
        `series_names_in_`.

    """

    if isinstance(self.lags, dict):
        lags_keys = list(self.lags.keys())
        if set(lags_keys) != set(series_names_in_):  # Set to avoid order
            raise ValueError(
                f"When `lags` parameter is a `dict`, its keys must be the "
                f"same as `series` column names. If don't want to include lags, "
                 "add '{column: None}' to the lags dict.\n"
                f"  Lags keys        : {lags_keys}.\n"
                f"  `series` columns : {series_names_in_}."
            )
        self.lags_ = copy(self.lags)
    else:
        self.lags_ = {series: self.lags for series in series_names_in_}
        if self.lags is not None:
            # Defined `lags_names` here to avoid overwriting when fit and then create_train_X_y
            lags_names = [f'lag_{i}' for i in self.lags]
            self.lags_names = {
                series: [f'{series}_{lag}' for lag in lags_names]
                for series in series_names_in_
            }
        else:
            self.lags_names = {series: None for series in series_names_in_}

    X_train_series_names_in_ = series_names_in_
    if self.lags is None:
        data_to_return_dict = {self.level: 'y'}
    else:
        # If col is not level and has lags, create 'X' if no lags don't include
        # If col is level, create 'both' (`X` and `y`)
        data_to_return_dict = {
            col: ('both' if col == self.level else 'X')
            for col in series_names_in_
            if col == self.level or self.lags_.get(col) is not None
        }

        # Adjust 'level' in case self.lags_[level] is None
        if self.lags_.get(self.level) is None:
            data_to_return_dict[self.level] = 'y'

        if self.window_features is None:
            # X_train_series_names_in_ include series that will be added to X_train
            X_train_series_names_in_ = [
                col for col in data_to_return_dict.keys()
                if data_to_return_dict[col] in ['X', 'both']
            ]

    return data_to_return_dict, X_train_series_names_in_

_create_lags

_create_lags(y, lags, data_to_return='both')

Create the lagged values and their target variable from a time series.

Note that the returned matrix X_data contains the lag 1 in the first column, the lag 2 in the in the second column and so on.

Parameters:

Name	Type	Description	Default
y	numpy ndarray	Training time series values.	required
lags	numpy ndarray	lags to create.	required
data_to_return	str	Specifies which data to return. Options are 'X', 'y', 'both' or None.	'both'

Returns:

Name	Type	Description
X_data	numpy ndarray, None	Lagged values (predictors).
y_data	numpy ndarray, None	Values of the time series related to each row of X_data.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _create_lags(
    self, 
    y: np.ndarray,
    lags: np.ndarray,
    data_to_return: str | None = 'both'
) -> tuple[np.ndarray | None, np.ndarray | None]:
    """
    Create the lagged values and their target variable from a time series.

    Note that the returned matrix `X_data` contains the lag 1 in the first 
    column, the lag 2 in the in the second column and so on.

    Parameters
    ----------
    y : numpy ndarray
        Training time series values.
    lags : numpy ndarray
        lags to create.
    data_to_return : str, default 'both'
        Specifies which data to return. Options are 'X', 'y', 'both' or None.

    Returns
    -------
    X_data : numpy ndarray, None
        Lagged values (predictors).
    y_data : numpy ndarray, None
        Values of the time series related to each row of `X_data`.

    """

    X_data = None
    y_data = None
    if data_to_return is not None:

        n_rows = len(y) - self.window_size - (self.steps - 1)

        if data_to_return != 'y':
            # If `data_to_return` is not 'y', it means is 'X' or 'both', X_data is created
            X_data = np.full(
                shape=(n_rows, len(lags)), fill_value=np.nan, order='F', dtype=float
            )
            for i, lag in enumerate(lags):
                X_data[:, i] = y[self.window_size - lag : -(lag + self.steps - 1)]

        if data_to_return != 'X':
            # If `data_to_return` is not 'X', it means is 'y' or 'both', y_data is created
            y_data = np.full(
                shape=(n_rows, self.steps), fill_value=np.nan, order='F', dtype=float
            )
            for step in range(self.steps):
                y_data[:, step] = y[self.window_size + step : self.window_size + step + n_rows]

    return X_data, y_data

_create_window_features

_create_window_features(y, train_index, X_as_pandas=False)

Parameters:

Name	Type	Description	Default
y	pandas Series	Training time series.	required
train_index	pandas Index	Index of the training data. It is used to create the pandas DataFrame X_train_window_features when X_as_pandas is True.	required
X_as_pandas	bool	If True, the returned matrix X_train_window_features is a pandas DataFrame.	False

Returns:

Name	Type	Description
X_train_window_features	list	List of numpy ndarrays or pandas DataFrames with the window features.
X_train_window_features_names_out_	list	Names of the window features.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _create_window_features(
    self, 
    y: pd.Series,
    train_index: pd.Index,
    X_as_pandas: bool = False,
) -> tuple[list[np.ndarray | pd.DataFrame], list[str]]:
    """

    Parameters
    ----------
    y : pandas Series
        Training time series.
    train_index : pandas Index
        Index of the training data. It is used to create the pandas DataFrame
        `X_train_window_features` when `X_as_pandas` is `True`.
    X_as_pandas : bool, default False
        If `True`, the returned matrix `X_train_window_features` is a 
        pandas DataFrame.

    Returns
    -------
    X_train_window_features : list
        List of numpy ndarrays or pandas DataFrames with the window features.
    X_train_window_features_names_out_ : list
        Names of the window features.

    """

    len_train_index = len(train_index)
    X_train_window_features = []
    X_train_window_features_names_out_ = []
    for wf in self.window_features:
        X_train_wf = wf.transform_batch(y)
        if not isinstance(X_train_wf, pd.DataFrame):
            raise TypeError(
                f"The method `transform_batch` of {type(wf).__name__} "
                f"must return a pandas DataFrame."
            )
        X_train_wf = X_train_wf.iloc[-len_train_index:]
        if not len(X_train_wf) == len_train_index:
            raise ValueError(
                f"The method `transform_batch` of {type(wf).__name__} "
                f"must return a DataFrame with the same number of rows as "
                f"the input time series - (`window_size` + (`steps` - 1)): {len_train_index}."
            )
        X_train_wf.index = train_index

        X_train_wf.columns = [f'{y.name}_{col}' for col in X_train_wf.columns]
        X_train_window_features_names_out_.extend(X_train_wf.columns)
        if not X_as_pandas:
            X_train_wf = X_train_wf.to_numpy()     
        X_train_window_features.append(X_train_wf)

    return X_train_window_features, X_train_window_features_names_out_

_create_train_X_y

_create_train_X_y(series, exog=None)

Create training matrices from multiple time series and exogenous variables. The resulting matrices contain the target variable and predictors needed to train all the regressors (one per step).

Parameters:

Name	Type	Description	Default
series	pandas DataFrame	Training time series.	required
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s. Must have the same number of observations as series and their indexes must be aligned.	None

Returns:

Name	Type	Description
X_train	pandas DataFrame	Training values (predictors) for each step. Note that the index corresponds to that of the last step. It is updated for the corresponding step in the filter_train_X_y_for_step method.
y_train	dict	Values of the time series related to each row of X_train for each step in the form {step: y_step_[i]}.
series_names_in_	list	Names of the series used during training.
X_train_series_names_in_	list	Names of the series added to X_train when creating the training matrices with _create_train_X_y method. It is a subset of series_names_in_.
exog_names_in_	list	Names of the exogenous variables included in the training matrices.
X_train_exog_names_out_	list	Names of the exogenous variables included in the matrix X_train created internally for training. It can be different from exog_names_in_ if some exogenous variables are transformed during the training process.
X_train_features_names_out_	list	Names of the columns of the matrix created internally for training.
exog_dtypes_in_	dict	Type of each exogenous variable/s used in training. If transformer_exog is used, the dtypes are calculated before the transformation.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _create_train_X_y(
    self,
    series: pd.DataFrame,
    exog: pd.Series | pd.DataFrame | None = None
) -> tuple[
    pd.DataFrame, 
    dict[int, pd.Series], 
    list[str], 
    list[str], 
    list[str], 
    list[str], 
    list[str], 
    dict[str, type]
]:
    """
    Create training matrices from multiple time series and exogenous
    variables. The resulting matrices contain the target variable and predictors
    needed to train all the regressors (one per step).

    Parameters
    ----------
    series : pandas DataFrame
        Training time series.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s. Must have the same
        number of observations as `series` and their indexes must be aligned.

    Returns
    -------
    X_train : pandas DataFrame
        Training values (predictors) for each step. Note that the index 
        corresponds to that of the last step. It is updated for the corresponding 
        step in the filter_train_X_y_for_step method.
    y_train : dict
        Values of the time series related to each row of `X_train` for each 
        step in the form {step: y_step_[i]}.
    series_names_in_ : list
        Names of the series used during training.
    X_train_series_names_in_ : list
        Names of the series added to `X_train` when creating the training
        matrices with `_create_train_X_y` method. It is a subset of 
        `series_names_in_`.
    exog_names_in_ : list
        Names of the exogenous variables included in the training matrices.
    X_train_exog_names_out_ : list
        Names of the exogenous variables included in the matrix `X_train` created
        internally for training. It can be different from `exog_names_in_` if
        some exogenous variables are transformed during the training process.
    X_train_features_names_out_ : list
        Names of the columns of the matrix created internally for training.
    exog_dtypes_in_ : dict
        Type of each exogenous variable/s used in training. If `transformer_exog` 
        is used, the dtypes are calculated before the transformation.

    """

    if not isinstance(series, pd.DataFrame):
        raise TypeError(
            f"`series` must be a pandas DataFrame. Got {type(series)}."
        )

    if len(series) < self.window_size + self.steps:
        raise ValueError(
            f"Minimum length of `series` for training this forecaster is "
            f"{self.window_size + self.steps}. Reduce the number of "
            f"predicted steps, {self.steps}, or the maximum "
            f"window_size, {self.window_size}, if no more data is available.\n"
            f"    Length `series`: {len(series)}.\n"
            f"    Max step : {self.steps}.\n"
            f"    Max window size: {self.window_size}.\n"
            f"    Lags window size: {self.max_lag}.\n"
            f"    Window features window size: {self.max_size_window_features}."
        )

    series_names_in_ = list(series.columns)

    if self.level not in series_names_in_:
        raise ValueError(
            f"One of the `series` columns must be named as the `level` of the forecaster.\n"
            f"  Forecaster `level` : {self.level}.\n"
            f"  `series` columns   : {series_names_in_}."
        )

    data_to_return_dict, X_train_series_names_in_ = (
        self._create_data_to_return_dict(series_names_in_=series_names_in_)
    )

    series_to_create_autoreg_features_and_y = [
        col for col in series_names_in_ 
        if col in X_train_series_names_in_ + [self.level]
    ]

    fit_transformer = False
    if not self.is_fitted:
        fit_transformer = True
        self.transformer_series_ = initialize_transformer_series(
                                       forecaster_name    = type(self).__name__,
                                       series_names_in_   = series_to_create_autoreg_features_and_y,
                                       transformer_series = self.transformer_series
                                   )

    if self.differentiation is None:
        self.differentiator_ = {
            serie: None for serie in series_to_create_autoreg_features_and_y
        }
    else:
        if not self.is_fitted:
            self.differentiator_ = {
                serie: copy(self.differentiator)
                for serie in series_to_create_autoreg_features_and_y
            }

    exog_names_in_ = None
    exog_dtypes_in_ = None
    categorical_features = False
    if exog is not None:
        check_exog(exog=exog, allow_nan=True)
        exog = input_to_frame(data=exog, input_name='exog')

        series_index_no_ws = series.index[self.window_size:]
        len_series = len(series)
        len_series_no_ws = len_series - self.window_size
        len_exog = len(exog)
        if not len_exog == len_series and not len_exog == len_series_no_ws:
            raise ValueError(
                f"Length of `exog` must be equal to the length of `series` (if "
                f"index is fully aligned) or length of `series` - `window_size` "
                f"(if `exog` starts after the first `window_size` values).\n"
                f"    `exog`                   : ({exog.index[0]} -- {exog.index[-1]})  (n={len_exog})\n"
                f"    `series`                 : ({series.index[0]} -- {series.index[-1]})  (n={len_series})\n"
                f"    `series` - `window_size` : ({series_index_no_ws[0]} -- {series_index_no_ws[-1]})  (n={len_series_no_ws})"
            )

        exog_names_in_ = exog.columns.to_list()
        if len(set(exog_names_in_) - set(series_names_in_)) != len(exog_names_in_):
            raise ValueError(
                f"`exog` cannot contain a column named the same as one of "
                f"the series (column names of series).\n"
                f"  `series` columns : {series_names_in_}.\n"
                f"  `exog`   columns : {exog_names_in_}."
            )

        # NOTE: Need here for filter_train_X_y_for_step to work without fitting
        self.exog_in_ = True
        exog_dtypes_in_ = get_exog_dtypes(exog=exog)

        exog = transform_dataframe(
                   df                = exog,
                   transformer       = self.transformer_exog,
                   fit               = fit_transformer,
                   inverse_transform = False
               )

        check_exog_dtypes(exog, call_check_exog=True)
        categorical_features = (
            exog.select_dtypes(include=np.number).shape[1] != exog.shape[1]
        )

        # Use .index as series.index is not yet preprocessed with preprocess_y
        if len_exog == len_series:
            if not (exog.index == series.index).all():
                raise ValueError(
                    "When `exog` has the same length as `series`, the index "
                    "of `exog` must be aligned with the index of `series` "
                    "to ensure the correct alignment of values."
                )
            # The first `self.window_size` positions have to be removed from 
            # exog since they are not in X_train.
            exog = exog.iloc[self.window_size:, ]
        else:
            if not (exog.index == series_index_no_ws).all():
                raise ValueError(
                    "When `exog` doesn't contain the first `window_size` "
                    "observations, the index of `exog` must be aligned with "
                    "the index of `series` minus the first `window_size` "
                    "observations to ensure the correct alignment of values."
                )

    X_train_autoreg = []
    X_train_window_features_names_out_ = [] if self.window_features is not None else None
    X_train_features_names_out_ = []
    for col in series_to_create_autoreg_features_and_y:
        y = series[col]
        check_y(y=y, series_id=f"Column '{col}'")
        y = transform_series(
                series            = y,
                transformer       = self.transformer_series_[col],
                fit               = fit_transformer,
                inverse_transform = False
            )
        y_values, y_index = preprocess_y(y=y)

        if self.differentiation is not None:
            if not self.is_fitted:
                y_values = self.differentiator_[col].fit_transform(y_values)
            else:
                differentiator = copy(self.differentiator_[col])
                y_values = differentiator.fit_transform(y_values)

        X_train_autoreg_col = []
        train_index = y_index[self.window_size + (self.steps - 1):]

        X_train_lags, y_train_values = self._create_lags(
            y=y_values, lags=self.lags_[col], data_to_return=data_to_return_dict.get(col, None)
        )
        if X_train_lags is not None:
            X_train_autoreg_col.append(X_train_lags)
            X_train_features_names_out_.extend(self.lags_names[col])

        if col == self.level:
            y_train = y_train_values

        if self.window_features is not None:
            n_diff = 0 if self.differentiation is None else self.differentiation
            end_wf = None if self.steps == 1 else -(self.steps - 1)
            y_window_features = pd.Series(
                y_values[n_diff:end_wf], index=y_index[n_diff:end_wf], name=col
            )
            X_train_window_features, X_train_wf_names_out_ = (
                self._create_window_features(
                    y=y_window_features, X_as_pandas=False, train_index=train_index
                )
            )
            X_train_autoreg_col.extend(X_train_window_features)
            X_train_window_features_names_out_.extend(X_train_wf_names_out_)
            X_train_features_names_out_.extend(X_train_wf_names_out_)

        if X_train_autoreg_col:
            if len(X_train_autoreg_col) == 1:
                X_train_autoreg_col = X_train_autoreg_col[0]
            else:
                X_train_autoreg_col = np.concatenate(X_train_autoreg_col, axis=1)

            X_train_autoreg.append(X_train_autoreg_col)

    X_train = []
    len_train_index = len(train_index)
    if categorical_features:
        if len(X_train_autoreg) == 1:
            X_train_autoreg = X_train_autoreg[0]
        else:
            X_train_autoreg = np.concatenate(X_train_autoreg, axis=1)
        X_train_autoreg = pd.DataFrame(
                              data    = X_train_autoreg,
                              columns = X_train_features_names_out_,
                              index   = train_index
                          )
        X_train.append(X_train_autoreg)
    else:
        X_train.extend(X_train_autoreg)

    # NOTE: Need here for filter_train_X_y_for_step to work without fitting
    self.X_train_window_features_names_out_ = X_train_window_features_names_out_

    X_train_exog_names_out_ = None
    if exog is not None:
        X_train_exog_names_out_ = exog.columns.to_list()
        if categorical_features:
            exog_direct, X_train_direct_exog_names_out_ = exog_to_direct(
                exog=exog, steps=self.steps
            )
            exog_direct.index = train_index
        else:
            exog_direct, X_train_direct_exog_names_out_ = exog_to_direct_numpy(
                exog=exog, steps=self.steps
            )

        # NOTE: Need here for filter_train_X_y_for_step to work without fitting
        self.X_train_direct_exog_names_out_ = X_train_direct_exog_names_out_

        X_train_features_names_out_.extend(self.X_train_direct_exog_names_out_)
        X_train.append(exog_direct)

    if len(X_train) == 1:
        X_train = X_train[0]
    else:
        if categorical_features:
            X_train = pd.concat(X_train, axis=1)
        else:
            X_train = np.concatenate(X_train, axis=1)

    if categorical_features:
        X_train.index = train_index
    else:
        X_train = pd.DataFrame(
                      data    = X_train,
                      index   = train_index,
                      columns = X_train_features_names_out_
                  )

    y_train = {
        step: pd.Series(
                  data  = y_train[:, step - 1], 
                  index = y_index[self.window_size + step - 1:][:len_train_index],
                  name  = f"{self.level}_step_{step}"
              )
        for step in range(1, self.steps + 1)
    }

    return (
        X_train,
        y_train,
        series_names_in_,
        X_train_series_names_in_,
        exog_names_in_,
        X_train_exog_names_out_,
        X_train_features_names_out_,
        exog_dtypes_in_
    )

create_train_X_y

create_train_X_y(
    series, exog=None, suppress_warnings=False
)

Create training matrices from multiple time series and exogenous variables. The resulting matrices contain the target variable and predictors needed to train all the regressors (one per step).

Parameters:

Name	Type	Description	Default
series	pandas DataFrame	Training time series.	required
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s. Must have the same number of observations as series and their indexes must be aligned.	None
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the creation of the training matrices. See skforecast.exceptions.warn_skforecast_categories for more information.	False

Returns:

Name	Type	Description
X_train	pandas DataFrame	Training values (predictors) for each step. Note that the index corresponds to that of the last step. It is updated for the corresponding step in the filter_train_X_y_for_step method.
y_train	dict	Values of the time series related to each row of X_train for each step in the form {step: y_step_[i]}.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def create_train_X_y(
    self,
    series: pd.DataFrame,
    exog: pd.Series | pd.DataFrame | None = None,
    suppress_warnings: bool = False
) -> tuple[pd.DataFrame, dict[int, pd.Series]]:
    """
    Create training matrices from multiple time series and exogenous
    variables. The resulting matrices contain the target variable and predictors
    needed to train all the regressors (one per step).

    Parameters
    ----------
    series : pandas DataFrame
        Training time series.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s. Must have the same
        number of observations as `series` and their indexes must be aligned.
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the creation
        of the training matrices. See skforecast.exceptions.warn_skforecast_categories 
        for more information.

    Returns
    -------
    X_train : pandas DataFrame
        Training values (predictors) for each step. Note that the index 
        corresponds to that of the last step. It is updated for the corresponding 
        step in the filter_train_X_y_for_step method.
    y_train : dict
        Values of the time series related to each row of `X_train` for each 
        step in the form {step: y_step_[i]}.

    """

    set_skforecast_warnings(suppress_warnings, action='ignore')

    output = self._create_train_X_y(
                 series = series, 
                 exog   = exog
             )

    X_train = output[0]
    y_train = output[1]

    set_skforecast_warnings(suppress_warnings, action='default')

    return X_train, y_train

filter_train_X_y_for_step

filter_train_X_y_for_step(
    step, X_train, y_train, remove_suffix=False
)

Select the columns needed to train a forecaster for a specific step.
The input matrices should be created using _create_train_X_y method. This method updates the index of X_train to the corresponding one according to y_train. If remove_suffix=True the suffix "_step_i" will be removed from the column names.

Parameters:

Name	Type	Description	Default
step	int	step for which columns must be selected. Starts at 1.	required
X_train	pandas DataFrame	Dataframe created with the _create_train_X_y method, first return.	required
y_train	dict	Dict created with the _create_train_X_y method, second return.	required
remove_suffix	bool	If True, suffix "_step_i" is removed from the column names.	False

Returns:

Name	Type	Description
X_train_step	pandas DataFrame	Training values (predictors) for the selected step.
y_train_step	pandas Series	Values of the time series related to each row of X_train.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def filter_train_X_y_for_step(
    self,
    step: int,
    X_train: pd.DataFrame,
    y_train: dict[int, pd.Series],
    remove_suffix: bool = False
) -> tuple[pd.DataFrame, pd.Series]:
    """
    Select the columns needed to train a forecaster for a specific step.  
    The input matrices should be created using `_create_train_X_y` method. 
    This method updates the index of `X_train` to the corresponding one 
    according to `y_train`. If `remove_suffix=True` the suffix "_step_i" 
    will be removed from the column names. 

    Parameters
    ----------
    step : int
        step for which columns must be selected. Starts at 1.
    X_train : pandas DataFrame
        Dataframe created with the `_create_train_X_y` method, first return.
    y_train : dict
        Dict created with the `_create_train_X_y` method, second return.
    remove_suffix : bool, default False
        If True, suffix "_step_i" is removed from the column names.

    Returns
    -------
    X_train_step : pandas DataFrame
        Training values (predictors) for the selected step.
    y_train_step : pandas Series
        Values of the time series related to each row of `X_train`.

    """

    if (step < 1) or (step > self.steps):
        raise ValueError(
            f"Invalid value `step`. For this forecaster, minimum value is 1 "
            f"and the maximum step is {self.steps}."
        )

    y_train_step = y_train[step]

    # Matrix X_train starts at index 0.
    if not self.exog_in_:
        X_train_step = X_train
    else:
        n_lags = len(list(
            chain(*[v for v in self.lags_.values() if v is not None])
        ))
        n_window_features = (
            len(self.X_train_window_features_names_out_) if self.window_features is not None else 0
        )
        idx_columns_autoreg = np.arange(n_lags + n_window_features)
        n_exog = len(self.X_train_direct_exog_names_out_) / self.steps
        idx_columns_exog = (
            np.arange((step - 1) * n_exog, (step) * n_exog) + idx_columns_autoreg[-1] + 1 
        )
        idx_columns = np.concatenate((idx_columns_autoreg, idx_columns_exog))
        X_train_step = X_train.iloc[:, idx_columns]

    X_train_step.index = y_train_step.index

    if remove_suffix:
        X_train_step.columns = [
            col_name.replace(f"_step_{step}", "")
            for col_name in X_train_step.columns
        ]
        y_train_step.name = y_train_step.name.replace(f"_step_{step}", "")

    return X_train_step, y_train_step

_train_test_split_one_step_ahead

_train_test_split_one_step_ahead(
    series, initial_train_size, exog=None
)

Create matrices needed to train and test the forecaster for one-step-ahead predictions.

Parameters:

Name	Type	Description	Default
series	pandas DataFrame	Training time series.	required
initial_train_size	int	Initial size of the training set. It is the number of observations used to train the forecaster before making the first prediction.	required
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s. Must have the same number of observations as series and their indexes must be aligned.	None

Returns:

Name	Type	Description
X_train	pandas DataFrame	Predictor values used to train the model.
y_train	dict	Values of the time series related to each row of X_train for each step in the form {step: y_step_[i]}.
X_test	pandas DataFrame	Predictor values used to test the model.
y_test	dict	Values of the time series related to each row of X_test for each step in the form {step: y_step_[i]}.
X_train_encoding	pandas Series	Series identifiers for each row of X_train.
X_test_encoding	pandas Series	Series identifiers for each row of X_test.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _train_test_split_one_step_ahead(
    self,
    series: pd.DataFrame,
    initial_train_size: int,
    exog: pd.Series | pd.DataFrame | None = None
) -> tuple[
    pd.DataFrame, 
    dict[int, pd.Series], 
    pd.DataFrame, 
    dict[int, pd.Series], 
    pd.Series, 
    pd.Series
]:
    """
    Create matrices needed to train and test the forecaster for one-step-ahead
    predictions.

    Parameters
    ----------
    series : pandas DataFrame
        Training time series.
    initial_train_size : int
        Initial size of the training set. It is the number of observations used
        to train the forecaster before making the first prediction.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s. Must have the same
        number of observations as `series` and their indexes must be aligned.

    Returns
    -------
    X_train : pandas DataFrame
        Predictor values used to train the model.
    y_train : dict
        Values of the time series related to each row of `X_train` for each 
        step in the form {step: y_step_[i]}.
    X_test : pandas DataFrame
        Predictor values used to test the model.
    y_test : dict
        Values of the time series related to each row of `X_test` for each 
        step in the form {step: y_step_[i]}.
    X_train_encoding : pandas Series
        Series identifiers for each row of `X_train`.
    X_test_encoding : pandas Series
        Series identifiers for each row of `X_test`.

    """

    span_index = series.index

    fold = [
        [0, initial_train_size],
        [initial_train_size - self.window_size, initial_train_size],
        [initial_train_size - self.window_size, len(span_index)],
        [0, 0],  # Dummy value
        True
    ]
    data_fold = _extract_data_folds_multiseries(
                    series             = series,
                    folds              = [fold],
                    span_index         = span_index,
                    window_size        = self.window_size,
                    exog               = exog,
                    dropna_last_window = self.dropna_from_series,
                    externally_fitted  = False
                )
    series_train, _, levels_last_window, exog_train, exog_test, _ = next(data_fold)

    start_test_idx = initial_train_size - self.window_size
    series_test = series.iloc[start_test_idx:, :]
    series_test = series_test.loc[:, levels_last_window]
    series_test = series_test.dropna(axis=1, how='all')

    _is_fitted = self.is_fitted
    _series_names_in_ = self.series_names_in_
    _exog_names_in_ = self.exog_names_in_

    self.is_fitted = False
    X_train, y_train, series_names_in_, _, exog_names_in_, *_ = (
        self._create_train_X_y(
            series = series_train,
            exog   = exog_train,
        )
    )
    self.series_names_in_ = series_names_in_
    if exog is not None:
        self.exog_names_in_ = exog_names_in_
    self.is_fitted = True

    X_test, y_test, *_ = self._create_train_X_y(
                             series = series_test,
                             exog   = exog_test,
                         )
    self.is_fitted = _is_fitted
    self.series_names_in_ = _series_names_in_
    self.exog_names_in_ = _exog_names_in_

    X_train_encoding = pd.Series(self.level, index=X_train.index)
    X_test_encoding = pd.Series(self.level, index=X_test.index)

    return X_train, y_train, X_test, y_test, X_train_encoding, X_test_encoding

create_sample_weights

create_sample_weights(X_train)

Create weights for each observation according to the forecaster's attribute weight_func.

Parameters:

Name	Type	Description	Default
X_train	pandas DataFrame	Dataframe created with _create_train_X_y and filter_train_X_y_for_step` methods, first return.	required

Returns:

Name	Type	Description
sample_weight	numpy ndarray	Weights to use in fit method.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def create_sample_weights(
    self,
    X_train: pd.DataFrame
) -> np.ndarray:
    """
    Create weights for each observation according to the forecaster's attribute
    `weight_func`. 

    Parameters
    ----------
    X_train : pandas DataFrame
        Dataframe created with `_create_train_X_y` and filter_train_X_y_for_step`
        methods, first return.

    Returns
    -------
    sample_weight : numpy ndarray
        Weights to use in `fit` method.

    """

    sample_weight = None

    if self.weight_func is not None:
        sample_weight = self.weight_func(X_train.index)

    if sample_weight is not None:
        if np.isnan(sample_weight).any():
            raise ValueError(
                "The resulting `sample_weight` cannot have NaN values."
            )
        if np.any(sample_weight < 0):
            raise ValueError(
                "The resulting `sample_weight` cannot have negative values."
            )
        if np.sum(sample_weight) == 0:
            raise ValueError(
                ("The resulting `sample_weight` cannot be normalized because "
                 "the sum of the weights is zero.")
            )

    return sample_weight

fit

fit(
    series,
    exog=None,
    store_last_window=True,
    store_in_sample_residuals=False,
    random_state=123,
    suppress_warnings=False,
)

Training Forecaster.

Additional arguments to be passed to the fit method of the regressor can be added with the fit_kwargs argument when initializing the forecaster.

Parameters:

Name	Type	Description	Default
series	pandas DataFrame	Training time series.	required
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s. Must have the same number of observations as series and their indexes must be aligned so that series[i] is regressed on exog[i].	None
store_last_window	bool	Whether or not to store the last window (last_window_) of training data.	True
store_in_sample_residuals	bool	If True, in-sample residuals will be stored in the forecaster object after fitting (in_sample_residuals_ and in_sample_residuals_by_bin_ attributes). If False, only the intervals of the bins are stored.	False
random_state	int	Set a seed for the random generator so that the stored sample residuals are always deterministic.	123
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the training process. See skforecast.exceptions.warn_skforecast_categories for more information.	False

Returns:

Type	Description
None

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def fit(
    self,
    series: pd.DataFrame,
    exog: pd.Series | pd.DataFrame | None = None,
    store_last_window: bool = True,
    store_in_sample_residuals: bool = False,
    random_state: int = 123,
    suppress_warnings: bool = False
) -> None:
    """
    Training Forecaster.

    Additional arguments to be passed to the `fit` method of the regressor 
    can be added with the `fit_kwargs` argument when initializing the forecaster.

    Parameters
    ----------
    series : pandas DataFrame
        Training time series.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s. Must have the same
        number of observations as `series` and their indexes must be aligned so
        that series[i] is regressed on exog[i].
    store_last_window : bool, default True
        Whether or not to store the last window (`last_window_`) of training data.
    store_in_sample_residuals : bool, default False
        If `True`, in-sample residuals will be stored in the forecaster object
        after fitting (`in_sample_residuals_` and `in_sample_residuals_by_bin_`
        attributes).
        If `False`, only the intervals of the bins are stored.
    random_state : int, default 123
        Set a seed for the random generator so that the stored sample 
        residuals are always deterministic.
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the training 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.

    Returns
    -------
    None

    """

    set_skforecast_warnings(suppress_warnings, action='ignore')

    # Reset values in case the forecaster has already been fitted.
    self.lags_                              = None
    self.last_window_                       = None
    self.index_type_                        = None
    self.index_freq_                        = None
    self.training_range_                    = None
    self.series_names_in_                   = None
    self.exog_in_                           = False
    self.exog_names_in_                     = None
    self.exog_type_in_                      = None
    self.exog_dtypes_in_                    = None
    self.X_train_series_names_in_           = None
    self.X_train_window_features_names_out_ = None
    self.X_train_exog_names_out_            = None
    self.X_train_direct_exog_names_out_     = None
    self.X_train_features_names_out_        = None
    self.in_sample_residuals_               = {step: None for step in range(1, self.steps + 1)}
    self.in_sample_residuals_by_bin_        = None
    self.binner_intervals_                  = None
    self.is_fitted                          = False
    self.fit_date                           = None

    (
        X_train,
        y_train,
        series_names_in_,
        X_train_series_names_in_,
        exog_names_in_,
        X_train_exog_names_out_,
        X_train_features_names_out_,
        exog_dtypes_in_
    ) = self._create_train_X_y(series=series, exog=exog)

    def fit_forecaster(regressor, X_train, y_train, step, store_in_sample_residuals, random_state):
        """
        Auxiliary function to fit each of the forecaster's regressors in parallel.

        Parameters
        ----------
        regressor : object
            Regressor to be fitted.
        X_train : pandas DataFrame
            Dataframe created with the `_create_train_X_y` method, first return.
        y_train : dict
            Dict created with the `_create_train_X_y` method, second return.
        step : int
            Step of the forecaster to be fitted.
        store_in_sample_residuals : bool
            If `True`, in-sample residuals will be stored in the forecaster object
            after fitting (`in_sample_residuals_` and `in_sample_residuals_by_bin_`
            attributes).
            If `False`, only the intervals of the bins are stored.
        random_state : int, default 123
            Set a seed for the random generator so that the stored sample 
            residuals are always deterministic.

        Returns
        -------
        Tuple with the step, fitted regressor, in-sample residuals, true values
        and predicted values for the step.

        """

        X_train_step, y_train_step = self.filter_train_X_y_for_step(
                                         step          = step,
                                         X_train       = X_train,
                                         y_train       = y_train,
                                         remove_suffix = True
                                     )
        sample_weight = self.create_sample_weights(X_train=X_train_step)
        if sample_weight is not None:
            regressor.fit(
                X             = X_train_step,
                y             = y_train_step,
                sample_weight = sample_weight,
                **self.fit_kwargs
            )
        else:
            regressor.fit(
                X = X_train_step,
                y = y_train_step,
                **self.fit_kwargs
            )

        # NOTE: This is done to save time during fit in functions such as backtesting()
        y_true_step = None
        y_pred_step = None
        residuals = None
        if self._probabilistic_mode is not False:
            y_true_step = y_train_step.to_numpy()
            y_pred_step = regressor.predict(X_train_step)
            if store_in_sample_residuals:
                residuals = y_true_step - y_pred_step
                if len(residuals) > 10_000:
                    rng = np.random.default_rng(seed=random_state)
                    residuals = residuals[
                        rng.integers(low=0, high=len(residuals), size=10_000)
                    ]

        return step, regressor, residuals, y_true_step, y_pred_step

    results_fit = (
        Parallel(n_jobs=self.n_jobs)
        (delayed(fit_forecaster)
        (
            regressor                 = copy(self.regressor),
            X_train                   = X_train,
            y_train                   = y_train,
            step                      = step,
            store_in_sample_residuals = store_in_sample_residuals,
            random_state              = random_state
        )
        for step in range(1, self.steps + 1))
    )

    self.regressors_ = {step: regressor for step, regressor, *_ in results_fit}

    if self._probabilistic_mode is not False:
        if store_in_sample_residuals:
            self.in_sample_residuals_ = {
                step: residuals 
                for step, _, residuals, *_ in results_fit
            }

        y_true, y_pred = zip(*[(y_true, y_pred) for *_, y_true, y_pred in results_fit])
        self._binning_in_sample_residuals(
            y_true                    = np.concatenate(y_true),
            y_pred                    = np.concatenate(y_pred),
            store_in_sample_residuals = store_in_sample_residuals,
            random_state              = random_state
        )

    self.series_names_in_ = series_names_in_
    self.X_train_series_names_in_ = X_train_series_names_in_
    self.X_train_features_names_out_ = X_train_features_names_out_

    self.is_fitted = True
    self.fit_date = pd.Timestamp.today().strftime('%Y-%m-%d %H:%M:%S')
    self.training_range_ = preprocess_y(
        y=series[self.level], return_values=False, suppress_warnings=True
    )[1][[0, -1]]
    self.index_type_ = type(X_train.index)
    if isinstance(X_train.index, pd.DatetimeIndex):
        self.index_freq_ = X_train.index.freqstr
    else: 
        self.index_freq_ = X_train.index.step

    if exog is not None:
        self.exog_in_ = True
        self.exog_names_in_ = exog_names_in_
        self.exog_type_in_ = type(exog)
        self.exog_dtypes_in_ = exog_dtypes_in_
        self.X_train_exog_names_out_ = X_train_exog_names_out_

    if store_last_window:
        self.last_window_ = series.iloc[-self.window_size:, ][
            self.X_train_series_names_in_
        ].copy()

    set_skforecast_warnings(suppress_warnings, action='default')

_binning_in_sample_residuals

_binning_in_sample_residuals(
    y_true,
    y_pred,
    store_in_sample_residuals=False,
    random_state=123,
)

Bin residuals according to the predicted value each residual is associated with. First a skforecast.preprocessing.QuantileBinner object is fitted to the predicted values. Then, residuals are binned according to the predicted value each residual is associated with. Residuals are stored in the forecaster object as in_sample_residuals_ and in_sample_residuals_by_bin_.

y_true and y_pred assumed to be differentiated and or transformed according to the attributes differentiation and transformer_y. The number of residuals stored per bin is limited to 10_000 // self.binner.n_bins_. The total number of residuals stored is 10_000. New in version 0.15.0

Parameters:

Name	Type	Description	Default
y_true	numpy ndarray	True values of the time series.	required
y_pred	numpy ndarray	Predicted values of the time series.	required
store_in_sample_residuals	bool	If True, in-sample residuals will be stored in the forecaster object after fitting (in_sample_residuals_ and in_sample_residuals_by_bin_ attributes). If False, only the intervals of the bins are stored.	False
random_state	int	Set a seed for the random generator so that the stored sample residuals are always deterministic.	123

Returns:

Type	Description
None

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _binning_in_sample_residuals(
    self,
    y_true: np.ndarray,
    y_pred: np.ndarray,
    store_in_sample_residuals: bool = False,
    random_state: int = 123
) -> None:
    """
    Bin residuals according to the predicted value each residual is
    associated with. First a `skforecast.preprocessing.QuantileBinner` object
    is fitted to the predicted values. Then, residuals are binned according
    to the predicted value each residual is associated with. Residuals are
    stored in the forecaster object as `in_sample_residuals_` and
    `in_sample_residuals_by_bin_`.

    `y_true` and `y_pred` assumed to be differentiated and or transformed
    according to the attributes `differentiation` and `transformer_y`.
    The number of residuals stored per bin is limited to 
    `10_000 // self.binner.n_bins_`. The total number of residuals stored is
    `10_000`.
    **New in version 0.15.0**

    Parameters
    ----------
    y_true : numpy ndarray
        True values of the time series.
    y_pred : numpy ndarray
        Predicted values of the time series.
    store_in_sample_residuals : bool, default False
        If `True`, in-sample residuals will be stored in the forecaster object
        after fitting (`in_sample_residuals_` and `in_sample_residuals_by_bin_`
        attributes).
        If `False`, only the intervals of the bins are stored.
    random_state : int, default 123
        Set a seed for the random generator so that the stored sample 
        residuals are always deterministic.

    Returns
    -------
    None

    """

    residuals = y_true - y_pred

    if self._probabilistic_mode == "binned":
        data = pd.DataFrame({'prediction': y_pred, 'residuals': residuals})
        data['bin'] = self.binner.fit(y_pred)
        self.binner_intervals_ = self.binner.intervals_

        if store_in_sample_residuals:
            data['bin'] = self.binner.transform(y_pred).astype(int)
            self.in_sample_residuals_by_bin_ = (
                data.groupby('bin')['residuals'].apply(np.array).to_dict()
            )

            rng = np.random.default_rng(seed=random_state)
            max_sample = 10_000 // self.binner.n_bins_
            for k, v in self.in_sample_residuals_by_bin_.items():
                if len(v) > max_sample:
                    sample = v[rng.integers(low=0, high=len(v), size=max_sample)]
                    self.in_sample_residuals_by_bin_[k] = sample

_create_predict_inputs

_create_predict_inputs(
    steps=None,
    last_window=None,
    exog=None,
    predict_probabilistic=False,
    use_in_sample_residuals=True,
    use_binned_residuals=True,
    check_inputs=True,
)

Create the inputs needed for the prediction process.

Parameters:

Name	Type	Description	Default
steps	(int, list, None)	Predict n steps. The value of steps must be less than or equal to the value of steps defined when initializing the forecaster. Starts at 1. If int: Only steps within the range of 1 to int are predicted. If list: List of ints. Only the steps contained in the list are predicted. If None: As many steps are predicted as were defined at initialization.	None
last_window	pandas Series, pandas DataFrame	Series values used to create the predictors (lags) needed to predict steps. If last_window = None, the values stored in self.last_window_ are used to calculate the initial predictors, and the predictions start right after training data.	None
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s.	None
predict_probabilistic	bool	If True, the necessary checks for probabilistic predictions will be performed.	False
use_in_sample_residuals	bool	If True, residuals from the training data are used as proxy of prediction error to create predictions. If False, out of sample residuals (calibration) are used. Out-of-sample residuals must be precomputed using Forecaster's set_out_sample_residuals() method.	True
use_binned_residuals	bool	If True, residuals are selected based on the predicted values (binned selection). If False, residuals are selected randomly.	True
check_inputs	bool	If True, the input is checked for possible warnings and errors with the check_predict_input function. This argument is created for internal use and is not recommended to be changed.	True

Returns:

Name	Type	Description
Xs	list	List of numpy arrays with the predictors for each step.
Xs_col_names	list	Names of the columns of the matrix created internally for prediction.
steps	list	Steps to predict.
prediction_index	pandas Index	Index of the predictions.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _create_predict_inputs(
    self,
    steps: int | list[int] | None = None,
    last_window: pd.DataFrame | None = None,
    exog: pd.Series | pd.DataFrame | None = None,
    predict_probabilistic: bool = False,
    use_in_sample_residuals: bool = True,
    use_binned_residuals: bool = True,
    check_inputs: bool = True
) -> tuple[list[np.ndarray], list[str], list[int], pd.Index]:
    """
    Create the inputs needed for the prediction process.

    Parameters
    ----------
    steps : int, list, None, default None
        Predict n steps. The value of `steps` must be less than or equal to the 
        value of steps defined when initializing the forecaster. Starts at 1.

        - If `int`: Only steps within the range of 1 to int are predicted.
        - If `list`: List of ints. Only the steps contained in the list 
        are predicted.
        - If `None`: As many steps are predicted as were defined at 
        initialization.
    last_window : pandas Series, pandas DataFrame, default None
        Series values used to create the predictors (lags) needed to 
        predict `steps`.
        If `last_window = None`, the values stored in `self.last_window_` are
        used to calculate the initial predictors, and the predictions start
        right after training data.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s.
    predict_probabilistic : bool, default False
        If `True`, the necessary checks for probabilistic predictions will be 
        performed.
    use_in_sample_residuals : bool, default True
        If `True`, residuals from the training data are used as proxy of
        prediction error to create predictions. 
        If `False`, out of sample residuals (calibration) are used. 
        Out-of-sample residuals must be precomputed using Forecaster's
        `set_out_sample_residuals()` method.
    use_binned_residuals : bool, default True
        If `True`, residuals are selected based on the predicted values 
        (binned selection).
        If `False`, residuals are selected randomly.
    check_inputs : bool, default True
        If `True`, the input is checked for possible warnings and errors 
        with the `check_predict_input` function. This argument is created 
        for internal use and is not recommended to be changed.

    Returns
    -------
    Xs : list
        List of numpy arrays with the predictors for each step.
    Xs_col_names : list
        Names of the columns of the matrix created internally for prediction.
    steps : list
        Steps to predict.
    prediction_index : pandas Index
        Index of the predictions.

    """

    steps = prepare_steps_direct(
                steps    = steps,
                max_step = self.steps
            )

    if last_window is None:
        last_window = self.last_window_

    if check_inputs:
        check_predict_input(
            forecaster_name  = type(self).__name__,
            steps            = steps,
            is_fitted        = self.is_fitted,
            exog_in_         = self.exog_in_,
            index_type_      = self.index_type_,
            index_freq_      = self.index_freq_,
            window_size      = self.window_size,
            last_window      = last_window,
            exog             = exog,
            exog_type_in_    = self.exog_type_in_,
            exog_names_in_   = self.exog_names_in_,
            interval         = None,
            max_steps        = self.steps,
            series_names_in_ = self.X_train_series_names_in_
        )

        if predict_probabilistic:
            check_residuals_input(
                forecaster_name              = type(self).__name__,
                use_in_sample_residuals      = use_in_sample_residuals,
                in_sample_residuals_         = self.in_sample_residuals_,
                out_sample_residuals_        = self.out_sample_residuals_,
                use_binned_residuals         = use_binned_residuals,
                in_sample_residuals_by_bin_  = self.in_sample_residuals_by_bin_,
                out_sample_residuals_by_bin_ = self.out_sample_residuals_by_bin_,
                steps                        = steps
            )

    last_window = last_window.iloc[
        -self.window_size:, last_window.columns.get_indexer(self.X_train_series_names_in_)
    ].copy()

    X_autoreg = []
    Xs_col_names = []
    for series in self.X_train_series_names_in_:
        last_window_series = transform_numpy(
                                 array             = last_window[series].to_numpy(),
                                 transformer       = self.transformer_series_[series],
                                 fit               = False,
                                 inverse_transform = False
                             )

        if self.differentiation is not None:
            last_window_series = self.differentiator_[series].fit_transform(last_window_series)

        if self.lags is not None:
            X_lags = last_window_series[-self.lags_[series]]
            X_autoreg.append(X_lags)
            Xs_col_names.extend(self.lags_names[series])

        if self.window_features is not None:
            n_diff = 0 if self.differentiation is None else self.differentiation
            X_window_features = np.concatenate(
                [
                    wf.transform(last_window_series[n_diff:]) 
                    for wf in self.window_features
                ]
            )
            X_autoreg.append(X_window_features)
            # HACK: This is not the best way to do it. Can have any problem
            # if the window_features are not in the same order as the
            # self.window_features_names.
            Xs_col_names.extend([f"{series}_{wf}" for wf in self.window_features_names])

    X_autoreg = np.concatenate(X_autoreg).reshape(1, -1)
    _, last_window_index = preprocess_last_window(
        last_window=last_window, return_values=False
    )
    if exog is not None:
        exog = input_to_frame(data=exog, input_name='exog')
        exog = exog.loc[:, self.exog_names_in_]
        exog = transform_dataframe(
                   df                = exog,
                   transformer       = self.transformer_exog,
                   fit               = False,
                   inverse_transform = False
               )
        check_exog_dtypes(exog=exog)
        exog_values, _ = exog_to_direct_numpy(
                             exog  = exog.to_numpy()[:max(steps)],
                             steps = max(steps)
                         )
        exog_values = exog_values[0]

        n_exog = exog.shape[1]
        Xs = [
            np.concatenate(
                [
                    X_autoreg, 
                    exog_values[(step - 1) * n_exog : step * n_exog].reshape(1, -1)
                ],
                axis=1
            )
            for step in steps
        ]
        # HACK: This is not the best way to do it. Can have any problem
        # if the exog_columns are not in the same order as the
        # self.window_features_names.
        Xs_col_names = Xs_col_names + exog.columns.to_list()
    else:
        Xs = [X_autoreg] * len(steps)

    prediction_index = expand_index(
                           index = last_window_index,
                           steps = max(steps)
                       )[np.array(steps) - 1]
    if isinstance(last_window_index, pd.DatetimeIndex) and np.array_equal(
        steps, np.arange(min(steps), max(steps) + 1)
    ):
        prediction_index.freq = last_window_index.freq

    # HACK: Why no use self.X_train_features_names_out_ as Xs_col_names?
    return Xs, Xs_col_names, steps, prediction_index

create_predict_X

create_predict_X(
    steps=None,
    last_window=None,
    exog=None,
    suppress_warnings=False,
)

Create the predictors needed to predict steps ahead.

Parameters:

Name	Type	Description	Default
steps	(int, list, None)	Predict n steps. The value of steps must be less than or equal to the value of steps defined when initializing the forecaster. Starts at 1. If int: Only steps within the range of 1 to int are predicted. If list: List of ints. Only the steps contained in the list are predicted. If None: As many steps are predicted as were defined at initialization.	None
last_window	pandas DataFrame	Series values used to create the predictors (lags) needed to predict steps. If last_window = None, the values stored in self.last_window_ are used to calculate the initial predictors, and the predictions start right after training data.	None
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s.	None
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the prediction process. See skforecast.exceptions.warn_skforecast_categories for more information.	False

Returns:

Name	Type	Description
X_predict	pandas DataFrame	Pandas DataFrame with the predictors for each step. The index is the same as the prediction index.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def create_predict_X(
    self,
    steps: int | list[int] | None = None,
    last_window: pd.DataFrame | None = None,
    exog: pd.Series | pd.DataFrame | None = None,
    suppress_warnings: bool = False
) -> pd.DataFrame:
    """
    Create the predictors needed to predict `steps` ahead.

    Parameters
    ----------
    steps : int, list, None, default None
        Predict n steps. The value of `steps` must be less than or equal to the 
        value of steps defined when initializing the forecaster. Starts at 1.

        - If `int`: Only steps within the range of 1 to int are predicted.
        - If `list`: List of ints. Only the steps contained in the list 
        are predicted.
        - If `None`: As many steps are predicted as were defined at 
        initialization.
    last_window : pandas DataFrame, default None
        Series values used to create the predictors (lags) needed to 
        predict `steps`.
        If `last_window = None`, the values stored in `self.last_window_` are
        used to calculate the initial predictors, and the predictions start
        right after training data.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s.
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the prediction 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.

    Returns
    -------
    X_predict : pandas DataFrame
        Pandas DataFrame with the predictors for each step. The index 
        is the same as the prediction index.

    """

    set_skforecast_warnings(suppress_warnings, action='ignore')

    (
        Xs,
        Xs_col_names,
        steps,
        prediction_index
    ) = self._create_predict_inputs(
            steps        = steps,
            last_window  = last_window,
            exog         = exog
        )

    X_predict = pd.DataFrame(
                    data    = np.concatenate(Xs, axis=0), 
                    columns = Xs_col_names, 
                    index   = prediction_index
                )

    if self.transformer_series is not None or self.differentiation is not None:
        warnings.warn(
            "The output matrix is in the transformed scale due to the "
            "inclusion of transformations or differentiation in the Forecaster. "
            "As a result, any predictions generated using this matrix will also "
            "be in the transformed scale. Please refer to the documentation "
            "for more details: "
            "https://skforecast.org/latest/user_guides/training-and-prediction-matrices.html",
            DataTransformationWarning
        )

    set_skforecast_warnings(suppress_warnings, action='default')

    return X_predict

predict

predict(
    steps=None,
    last_window=None,
    exog=None,
    suppress_warnings=False,
    check_inputs=True,
    levels=None,
)

Predict n steps ahead

Parameters:

Name	Type	Description	Default
steps	(int, list, None)	Predict n steps. The value of steps must be less than or equal to the value of steps defined when initializing the forecaster. Starts at 1. If int: Only steps within the range of 1 to int are predicted. If list: List of ints. Only the steps contained in the list are predicted. If None: As many steps are predicted as were defined at initialization.	None
last_window	pandas DataFrame	Series values used to create the predictors (lags) needed to predict steps. If last_window = None, the values stored in self.last_window_ are used to calculate the initial predictors, and the predictions start right after training data.	None
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s.	None
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the prediction process. See skforecast.exceptions.warn_skforecast_categories for more information.	False
check_inputs	bool	If True, the input is checked for possible warnings and errors with the check_predict_input function. This argument is created for internal use and is not recommended to be changed.	True
levels	Ignored	Not used, present here for API consistency by convention.	None

Returns:

Name	Type	Description
predictions	pandas DataFrame	Long-format DataFrame with the predictions. The columns are level and pred.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def predict(
    self,
    steps: int | list[int] | None = None,
    last_window: pd.DataFrame | None = None,
    exog: pd.Series | pd.DataFrame | None = None,
    suppress_warnings: bool = False,
    check_inputs: bool = True,
    levels: Any = None
) -> pd.DataFrame:
    """
    Predict n steps ahead

    Parameters
    ----------
    steps : int, list, None, default None
        Predict n steps. The value of `steps` must be less than or equal to the 
        value of steps defined when initializing the forecaster. Starts at 1.

        - If `int`: Only steps within the range of 1 to int are predicted.
        - If `list`: List of ints. Only the steps contained in the list 
        are predicted.
        - If `None`: As many steps are predicted as were defined at 
        initialization.
    last_window : pandas DataFrame, default None
        Series values used to create the predictors (lags) needed to 
        predict `steps`.
        If `last_window = None`, the values stored in `self.last_window_` are
        used to calculate the initial predictors, and the predictions start
        right after training data.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s.
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the prediction 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    check_inputs : bool, default True
        If `True`, the input is checked for possible warnings and errors 
        with the `check_predict_input` function. This argument is created 
        for internal use and is not recommended to be changed.
    levels : Ignored
        Not used, present here for API consistency by convention.

    Returns
    -------
    predictions : pandas DataFrame
        Long-format DataFrame with the predictions. The columns are `level`
        and `pred`.

    """

    set_skforecast_warnings(suppress_warnings, action='ignore')

    (
        Xs,
        _,
        steps,
        prediction_index
    ) = self._create_predict_inputs(
            steps        = steps,
            last_window  = last_window,
            exog         = exog,
            check_inputs = check_inputs,
        )

    regressors = [self.regressors_[step] for step in steps]
    with warnings.catch_warnings():
        warnings.filterwarnings(
            "ignore", 
            message="X does not have valid feature names", 
            category=UserWarning
        )
        predictions = np.array([
            regressor.predict(X).ravel()[0] 
            for regressor, X in zip(regressors, Xs)
        ])

    if self.differentiation is not None:
        predictions = (
            self.differentiator_[self.level]
            .inverse_transform_next_window(predictions)
        )

    predictions = transform_numpy(
                      array             = predictions,
                      transformer       = self.transformer_series_[self.level],
                      fit               = False,
                      inverse_transform = True
                  )

    # TODO: This DataFrame has freq because it only contain 1 level
    # TODO: Adapt to multiple levels
    # n_steps, n_levels = predictions.shape
    # predictions = pd.DataFrame(
    #     {"level": np.tile(levels, n_steps), "pred": predictions.ravel()},
    #     index = np.repeat(prediction_index, n_levels),
    # )
    predictions = pd.DataFrame(
        {"level": np.tile([self.level], len(steps)), "pred": predictions},
        index = prediction_index,
    )

    set_skforecast_warnings(suppress_warnings, action='default')

    return predictions

predict_bootstrapping

predict_bootstrapping(
    steps=None,
    last_window=None,
    exog=None,
    n_boot=250,
    random_state=123,
    use_in_sample_residuals=True,
    use_binned_residuals=True,
    suppress_warnings=False,
    levels=None,
)

Generate multiple forecasting predictions using a bootstrapping process. By sampling from a collection of past observed errors (the residuals), each iteration of bootstrapping generates a different set of predictions. See the References section for more information.

Parameters:

Name	Type	Description	Default
steps	(int, list, None)	Predict n steps. The value of steps must be less than or equal to the value of steps defined when initializing the forecaster. Starts at 1. If int: Only steps within the range of 1 to int are predicted. If list: List of ints. Only the steps contained in the list are predicted. If None: As many steps are predicted as were defined at initialization.	None
last_window	pandas DataFrame	Series values used to create the predictors (lags) needed to predict steps. If last_window = None, the values stored inself.last_window_ are used to calculate the initial predictors, and the predictions start right after training data.	None
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s.	None
n_boot	int	Number of bootstrapping iterations to perform when estimating prediction intervals.	250
use_in_sample_residuals	bool	If True, residuals from the training data are used as proxy of prediction error to create predictions. If False, out of sample residuals (calibration) are used. Out-of-sample residuals must be precomputed using Forecaster's set_out_sample_residuals() method.	True
use_binned_residuals	bool	If True, residuals are selected based on the predicted values (binned selection). If False, residuals are selected randomly.	True
random_state	int	Seed for the random number generator to ensure reproducibility.	123
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the prediction process. See skforecast.exceptions.warn_skforecast_categories for more information.	False
levels	Ignored	Not used, present here for API consistency by convention.	None

Returns:

Name	Type	Description
boot_predictions	pandas DataFrame	Long-format DataFrame with the bootstrapping predictions. The columns are level, pred_boot_0, pred_boot_1, ..., pred_boot_n_boot.

References

.. [1] MAPIE - Model Agnostic Prediction Interval Estimator. https://mapie.readthedocs.io/en/stable/theoretical_description_regression.html#the-split-method

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def predict_bootstrapping(
    self,
    steps: int | list[int] | None = None,
    last_window: pd.DataFrame | None = None,
    exog: pd.Series | pd.DataFrame | None = None,
    n_boot: int = 250,
    random_state: int = 123,
    use_in_sample_residuals: bool = True,
    use_binned_residuals: bool = True,
    suppress_warnings: bool = False,
    levels: Any = None
) -> pd.DataFrame:
    """
    Generate multiple forecasting predictions using a bootstrapping process. 
    By sampling from a collection of past observed errors (the residuals),
    each iteration of bootstrapping generates a different set of predictions. 
    See the References section for more information. 

    Parameters
    ----------
    steps : int, list, None, default None
        Predict n steps. The value of `steps` must be less than or equal to the 
        value of steps defined when initializing the forecaster. Starts at 1.

        - If `int`: Only steps within the range of 1 to int are predicted.
        - If `list`: List of ints. Only the steps contained in the list 
        are predicted.
        - If `None`: As many steps are predicted as were defined at 
        initialization.
    last_window : pandas DataFrame, default None
        Series values used to create the predictors (lags) needed to 
        predict `steps`.
        If `last_window = None`, the values stored in` self.last_window_` are
        used to calculate the initial predictors, and the predictions start
        right after training data.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s.     
    n_boot : int, default 250
        Number of bootstrapping iterations to perform when estimating prediction
        intervals.            
    use_in_sample_residuals : bool, default True
        If `True`, residuals from the training data are used as proxy of
        prediction error to create predictions. 
        If `False`, out of sample residuals (calibration) are used. 
        Out-of-sample residuals must be precomputed using Forecaster's
        `set_out_sample_residuals()` method.
    use_binned_residuals : bool, default True
        If `True`, residuals are selected based on the predicted values 
        (binned selection).
        If `False`, residuals are selected randomly.
    random_state : int, default 123
        Seed for the random number generator to ensure reproducibility.   
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the prediction 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    levels : Ignored
        Not used, present here for API consistency by convention.

    Returns
    -------
    boot_predictions : pandas DataFrame
        Long-format DataFrame with the bootstrapping predictions. The columns
        are `level`, `pred_boot_0`, `pred_boot_1`, ..., `pred_boot_n_boot`.

    References
    ----------
    .. [1] MAPIE - Model Agnostic Prediction Interval Estimator.
           https://mapie.readthedocs.io/en/stable/theoretical_description_regression.html#the-split-method

    """

    set_skforecast_warnings(suppress_warnings, action='ignore')

    (
        Xs,
        _,
        steps,
        prediction_index
    ) = self._create_predict_inputs(
            steps                   = steps, 
            last_window             = last_window, 
            exog                    = exog,
            predict_probabilistic   = True, 
            use_in_sample_residuals = use_in_sample_residuals,
            use_binned_residuals    = use_binned_residuals
        )

    if use_in_sample_residuals:
        residuals = self.in_sample_residuals_
        residuals_by_bin = self.in_sample_residuals_by_bin_
    else:
        residuals = self.out_sample_residuals_
        residuals_by_bin = self.out_sample_residuals_by_bin_

    # NOTE: Since residuals are {step/bin: residuals}, more n_boot iterations
    # than the number of residuals for the step/bin with more residuals, 
    # doesn't add any new information to the bootstrapping process.
    if use_binned_residuals:
        recommended_n_boot = np.max([v.size for v in residuals_by_bin.values()])
    else:
        recommended_n_boot = np.max([v.size for v in residuals.values()])

    if n_boot > recommended_n_boot:
        warnings.warn(
            f"`n_boot`, {n_boot}, is greater than the number of available "
            f"residuals. More than {recommended_n_boot} iterations don't "
            f"add new information to the bootstrapping process, but increase "
            f"the computational cost.",
            ResidualsUsageWarning
        )

    # NOTE: Predictors and residuals are transformed and differentiated
    regressors = [self.regressors_[step] for step in steps]
    with warnings.catch_warnings():
        warnings.filterwarnings(
            "ignore", 
            message="X does not have valid feature names", 
            category=UserWarning
        )
        predictions = np.array([
            regressor.predict(X).ravel()[0] 
            for regressor, X in zip(regressors, Xs)
        ])

    boot_predictions = np.tile(predictions, (n_boot, 1)).T
    boot_columns = [f"pred_boot_{i}" for i in range(n_boot)]

    rng = np.random.default_rng(seed=random_state)
    for i, step in enumerate(steps):

        if use_binned_residuals:
            predicted_bin = self.binner.transform(predictions[i]).item()
            step_residuals = residuals_by_bin[predicted_bin]
        else:
            step_residuals = residuals[step]
        len_step_residuals = len(step_residuals)

        # NOTE: If n_boot != len_step_residuals, upsample or downsample the 
        # residuals from the step/bin to match n_boot.
        if len_step_residuals != n_boot:
            step_residuals = step_residuals[
                rng.integers(low=0, high=len_step_residuals, size=n_boot)
            ]

        boot_predictions[i, :] = boot_predictions[i, :] + step_residuals

    if self.differentiation is not None:
        boot_predictions = (
            self.differentiator_[self.level]
            .inverse_transform_next_window(boot_predictions)
        )

    if self.transformer_series_[self.level]:
        boot_predictions = np.apply_along_axis(
                               func1d            = transform_numpy,
                               axis              = 0,
                               arr               = boot_predictions,
                               transformer       = self.transformer_series_[self.level],
                               fit               = False,
                               inverse_transform = True
                           )

    # TODO: This DataFrame has freq because it only contain 1 level
    # TODO: Adapt to multiple levels
    boot_predictions = pd.DataFrame(
                           data    = boot_predictions,
                           index   = prediction_index,
                           columns = boot_columns
                       )
    boot_predictions.insert(0, 'level', np.tile([self.level], len(steps)))

    set_skforecast_warnings(suppress_warnings, action='default')

    return boot_predictions

_predict_interval_conformal

_predict_interval_conformal(
    steps=None,
    last_window=None,
    exog=None,
    nominal_coverage=0.95,
    use_in_sample_residuals=True,
    use_binned_residuals=True,
)

Generate prediction intervals using the conformal prediction split method [1]_.

Parameters:

Name	Type	Description	Default
steps	(int, list, None)	Predict n steps. The value of steps must be less than or equal to the value of steps defined when initializing the forecaster. Starts at 1. If int: Only steps within the range of 1 to int are predicted. If list: List of ints. Only the steps contained in the list are predicted. If None: As many steps are predicted as were defined at initialization.	None
last_window	pandas DataFrame	Series values used to create the predictors (lags) needed to predict steps. If last_window = None, the values stored inself.last_window_ are used to calculate the initial predictors, and the predictions start right after training data.	None
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s.	None
nominal_coverage	float	Nominal coverage, also known as expected coverage, of the prediction intervals. Must be between 0 and 1.	0.95
use_in_sample_residuals	bool	If True, residuals from the training data are used as proxy of prediction error to create predictions. If False, out of sample residuals (calibration) are used. Out-of-sample residuals must be precomputed using Forecaster's set_out_sample_residuals() method.	True
use_binned_residuals	bool	If True, residuals are selected based on the predicted values (binned selection). If False, residuals are selected randomly.	True

Returns:

Name	Type	Description
predictions	pandas DataFrame	Values predicted by the forecaster and their estimated interval. pred: predictions. lower_bound: lower bound of the interval. upper_bound: upper bound of the interval.

References

.. [1] MAPIE - Model Agnostic Prediction Interval Estimator. https://mapie.readthedocs.io/en/stable/theoretical_description_regression.html#the-split-method

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def _predict_interval_conformal(
    self,
    steps: int | list[int] | None = None,
    last_window: pd.DataFrame | None = None,
    exog: pd.Series | pd.DataFrame | None = None,
    nominal_coverage: float = 0.95,
    use_in_sample_residuals: bool = True,
    use_binned_residuals: bool = True
) -> pd.DataFrame:
    """
    Generate prediction intervals using the conformal prediction 
    split method [1]_.

    Parameters
    ----------
    steps : int, list, None, default None
        Predict n steps. The value of `steps` must be less than or equal to the 
        value of steps defined when initializing the forecaster. Starts at 1.

        - If `int`: Only steps within the range of 1 to int are predicted.
        - If `list`: List of ints. Only the steps contained in the list 
        are predicted.
        - If `None`: As many steps are predicted as were defined at 
        initialization.
    last_window : pandas DataFrame, default None
        Series values used to create the predictors (lags) needed to 
        predict `steps`.
        If `last_window = None`, the values stored in` self.last_window_` are
        used to calculate the initial predictors, and the predictions start
        right after training data.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s.
    nominal_coverage : float, default 0.95
        Nominal coverage, also known as expected coverage, of the prediction
        intervals. Must be between 0 and 1.
    use_in_sample_residuals : bool, default True
        If `True`, residuals from the training data are used as proxy of
        prediction error to create predictions. 
        If `False`, out of sample residuals (calibration) are used. 
        Out-of-sample residuals must be precomputed using Forecaster's
        `set_out_sample_residuals()` method.
    use_binned_residuals : bool, default True
        If `True`, residuals are selected based on the predicted values 
        (binned selection).
        If `False`, residuals are selected randomly.

    Returns
    -------
    predictions : pandas DataFrame
        Values predicted by the forecaster and their estimated interval.

        - pred: predictions.
        - lower_bound: lower bound of the interval.
        - upper_bound: upper bound of the interval.

    References
    ----------
    .. [1] MAPIE - Model Agnostic Prediction Interval Estimator.
           https://mapie.readthedocs.io/en/stable/theoretical_description_regression.html#the-split-method

    """

    (
        Xs,
        _,
        steps,
        prediction_index
    ) = self._create_predict_inputs(
            steps                   = steps, 
            last_window             = last_window, 
            exog                    = exog,
            predict_probabilistic   = True, 
            use_in_sample_residuals = use_in_sample_residuals,
            use_binned_residuals    = use_binned_residuals
        )

    if use_in_sample_residuals:
        residuals = self.in_sample_residuals_
        residuals_by_bin = self.in_sample_residuals_by_bin_
    else:
        residuals = self.out_sample_residuals_
        residuals_by_bin = self.out_sample_residuals_by_bin_

    # NOTE: Predictors and residuals are transformed and differentiated  
    regressors = [self.regressors_[step] for step in steps]
    with warnings.catch_warnings():
        warnings.filterwarnings(
            "ignore", 
            message="X does not have valid feature names", 
            category=UserWarning
        )
        predictions = np.array([
            regressor.predict(X).ravel()[0] 
            for regressor, X in zip(regressors, Xs)
        ])

    if use_binned_residuals:
        correction_factor_by_bin = {
            k: np.quantile(np.abs(v), nominal_coverage)
            for k, v in residuals_by_bin.items()
        }
        replace_func = np.vectorize(lambda x: correction_factor_by_bin[x])
        predictions_bin = self.binner.transform(predictions)
        correction_factor = replace_func(predictions_bin)
    else:
        correction_factor = np.array([
            np.quantile(np.abs(residuals[step]), nominal_coverage) 
            for step in steps
        ])

    lower_bound = predictions - correction_factor
    upper_bound = predictions + correction_factor
    predictions = np.column_stack([predictions, lower_bound, upper_bound])

    if self.differentiation is not None:
        predictions = (
            self.differentiator_[self.level]
            .inverse_transform_next_window(predictions)
        )

    if self.transformer_series_[self.level]:
        predictions = np.apply_along_axis(
                          func1d            = transform_numpy,
                          axis              = 0,
                          arr               = predictions,
                          transformer       = self.transformer_series_[self.level],
                          fit               = False,
                          inverse_transform = True
                      )

    predictions = pd.DataFrame(
                      data    = predictions,
                      index   = prediction_index,
                      columns = ["pred", "lower_bound", "upper_bound"]
                  )
    predictions.insert(0, 'level', np.tile([self.level], len(steps)))

    return predictions

predict_interval

predict_interval(
    steps=None,
    last_window=None,
    exog=None,
    method="conformal",
    interval=[5, 95],
    n_boot=250,
    use_in_sample_residuals=True,
    use_binned_residuals=True,
    random_state=123,
    suppress_warnings=False,
    levels=None,
)

Predict n steps ahead and estimate prediction intervals using either bootstrapping or conformal prediction methods. Refer to the References section for additional details on these methods.

Parameters:

Name	Type	Description	Default
steps	(int, list, None)	Predict n steps. The value of steps must be less than or equal to the value of steps defined when initializing the forecaster. Starts at 1. If int: Only steps within the range of 1 to int are predicted. If list: List of ints. Only the steps contained in the list are predicted. If None: As many steps are predicted as were defined at initialization.	None
last_window	pandas DataFrame	Series values used to create the predictors (lags) needed to predict steps. If last_window = None, the values stored inself.last_window_ are used to calculate the initial predictors, and the predictions start right after training data.	None
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s.	None
method	str	Technique used to estimate prediction intervals. Available options: 'bootstrapping': Bootstrapping is used to generate prediction intervals [1]_. 'conformal': Employs the conformal prediction split method for interval estimation [2]_.	'conformal'
interval	(float, list, tuple)	Confidence level of the prediction interval. Interpretation depends on the method used: If float, represents the nominal (expected) coverage (between 0 and 1). For instance, interval=0.95 corresponds to [2.5, 97.5] percentiles. If list or tuple, defines the exact percentiles to compute, which must be between 0 and 100 inclusive. For example, interval of 95% should be as interval = [2.5, 97.5]. When using method='conformal', the interval must be a float or a list/tuple defining a symmetric interval.	[5, 95]
n_boot	int	Number of bootstrapping iterations to perform when estimating prediction intervals.	250
use_in_sample_residuals	bool	If True, residuals from the training data are used as proxy of prediction error to create predictions. If False, out of sample residuals (calibration) are used. Out-of-sample residuals must be precomputed using Forecaster's set_out_sample_residuals() method.	True
use_binned_residuals	bool	If True, residuals are selected based on the predicted values (binned selection). If False, residuals are selected randomly.	True
random_state	int	Seed for the random number generator to ensure reproducibility.	123
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the prediction process. See skforecast.exceptions.warn_skforecast_categories for more information.	False
levels	Ignored	Not used, present here for API consistency by convention.	None

Returns:

Name	Type	Description
predictions	pandas DataFrame	Long-format DataFrame with the predictions and the lower and upper bounds of the estimated interval. The columns are level, pred, lower_bound, upper_bound.

References

.. [1] Forecasting: Principles and Practice (3^rd ed) Rob J Hyndman and George Athanasopoulos. https://otexts.com/fpp3/prediction-intervals.html

.. [2] MAPIE - Model Agnostic Prediction Interval Estimator. https://mapie.readthedocs.io/en/stable/theoretical_description_regression.html#the-split-method

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def predict_interval(
    self,
    steps: int | list[int] | None = None,
    last_window: pd.DataFrame | None = None,
    exog: pd.Series | pd.DataFrame | None = None,
    method: str = 'conformal',
    interval: float | list[float] | tuple[float] = [5, 95],
    n_boot: int = 250,
    use_in_sample_residuals: bool = True,
    use_binned_residuals: bool = True,
    random_state: int = 123,
    suppress_warnings: bool = False,
    levels: Any = None
) -> pd.DataFrame:
    """
    Predict n steps ahead and estimate prediction intervals using either 
    bootstrapping or conformal prediction methods. Refer to the References 
    section for additional details on these methods.

    Parameters
    ----------
    steps : int, list, None, default None
        Predict n steps. The value of `steps` must be less than or equal to the 
        value of steps defined when initializing the forecaster. Starts at 1.

        - If `int`: Only steps within the range of 1 to int are predicted.
        - If `list`: List of ints. Only the steps contained in the list 
        are predicted.
        - If `None`: As many steps are predicted as were defined at 
        initialization.
    last_window : pandas DataFrame, default None
        Series values used to create the predictors (lags) needed to 
        predict `steps`.
        If `last_window = None`, the values stored in` self.last_window_` are
        used to calculate the initial predictors, and the predictions start
        right after training data.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s.
    method : str, default 'conformal'
        Technique used to estimate prediction intervals. Available options:

        - 'bootstrapping': Bootstrapping is used to generate prediction 
        intervals [1]_.
        - 'conformal': Employs the conformal prediction split method for 
        interval estimation [2]_.
    interval : float, list, tuple, default [5, 95]
        Confidence level of the prediction interval. Interpretation depends 
        on the method used:

        - If `float`, represents the nominal (expected) coverage (between 0 
        and 1). For instance, `interval=0.95` corresponds to `[2.5, 97.5]` 
        percentiles.
        - If `list` or `tuple`, defines the exact percentiles to compute, which 
        must be between 0 and 100 inclusive. For example, interval 
        of 95% should be as `interval = [2.5, 97.5]`.
        - When using `method='conformal'`, the interval must be a float or 
        a list/tuple defining a symmetric interval.
    n_boot : int, default 250
        Number of bootstrapping iterations to perform when estimating prediction
        intervals.
    use_in_sample_residuals : bool, default True
        If `True`, residuals from the training data are used as proxy of
        prediction error to create predictions. 
        If `False`, out of sample residuals (calibration) are used. 
        Out-of-sample residuals must be precomputed using Forecaster's
        `set_out_sample_residuals()` method.
    use_binned_residuals : bool, default True
        If `True`, residuals are selected based on the predicted values 
        (binned selection).
        If `False`, residuals are selected randomly.
    random_state : int, default 123
        Seed for the random number generator to ensure reproducibility.
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the prediction 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    levels : Ignored
        Not used, present here for API consistency by convention.

    Returns
    -------
    predictions : pandas DataFrame
        Long-format DataFrame with the predictions and the lower and upper
        bounds of the estimated interval. The columns are `level`, `pred`,
        `lower_bound`, `upper_bound`.

    References
    ----------
    .. [1] Forecasting: Principles and Practice (3rd ed) Rob J Hyndman and George Athanasopoulos.
           https://otexts.com/fpp3/prediction-intervals.html

    .. [2] MAPIE - Model Agnostic Prediction Interval Estimator.
           https://mapie.readthedocs.io/en/stable/theoretical_description_regression.html#the-split-method

    """

    set_skforecast_warnings(suppress_warnings, action='ignore')

    if method == "bootstrapping":

        if isinstance(interval, (list, tuple)):
            check_interval(interval=interval, ensure_symmetric_intervals=False)
            interval = np.array(interval) / 100
        else:
            check_interval(alpha=interval, alpha_literal='interval')
            interval = np.array([0.5 - interval / 2, 0.5 + interval / 2])

        boot_predictions = self.predict_bootstrapping(
                               steps                   = steps,
                               last_window             = last_window,
                               exog                    = exog,
                               n_boot                  = n_boot,
                               random_state            = random_state,
                               use_in_sample_residuals = use_in_sample_residuals,
                               use_binned_residuals    = use_binned_residuals
                           )

        predictions = self.predict(
                          steps        = steps,
                          last_window  = last_window,
                          exog         = exog,
                          check_inputs = False
                      )

        boot_predictions[['lower_bound', 'upper_bound']] = (
            boot_predictions.iloc[:, 1:].quantile(q=interval, axis=1).transpose()
        )
        predictions = pd.concat([
            predictions, boot_predictions[['lower_bound', 'upper_bound']]
        ], axis=1)

    elif method == 'conformal':

        if isinstance(interval, (list, tuple)):
            check_interval(interval=interval, ensure_symmetric_intervals=True)
            nominal_coverage = (interval[1] - interval[0]) / 100
        else:
            check_interval(alpha=interval, alpha_literal='interval')
            nominal_coverage = interval

        predictions = self._predict_interval_conformal(
                          steps                   = steps,
                          last_window             = last_window,
                          exog                    = exog,
                          nominal_coverage        = nominal_coverage,
                          use_in_sample_residuals = use_in_sample_residuals,
                          use_binned_residuals    = use_binned_residuals
                      )
    else:
        raise ValueError(
            f"Invalid `method` '{method}'. Choose 'bootstrapping' or 'conformal'."
        )

    set_skforecast_warnings(suppress_warnings, action='default')

    return predictions

predict_quantiles

predict_quantiles(
    steps=None,
    last_window=None,
    exog=None,
    quantiles=[0.05, 0.5, 0.95],
    n_boot=250,
    use_in_sample_residuals=True,
    use_binned_residuals=True,
    random_state=123,
    suppress_warnings=False,
    levels=None,
)

Bootstrapping based predicted quantiles.

Parameters:

Name	Type	Description	Default
steps	(int, list, None)	Predict n steps. The value of steps must be less than or equal to the value of steps defined when initializing the forecaster. Starts at 1. If int: Only steps within the range of 1 to int are predicted. If list: List of ints. Only the steps contained in the list are predicted. If None: As many steps are predicted as were defined at initialization.	None
last_window	pandas DataFrame	Series values used to create the predictors (lags) needed to predict steps. If last_window = None, the values stored inself.last_window_ are used to calculate the initial predictors, and the predictions start right after training data.	None
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s.	None
quantiles	(list, tuple)	Sequence of quantiles to compute, which must be between 0 and 1 inclusive. For example, quantiles of 0.05, 0.5 and 0.95 should be as quantiles = [0.05, 0.5, 0.95].	[0.05, 0.5, 0.95]
n_boot	int	Number of bootstrapping iterations to perform when estimating quantiles.	250
use_in_sample_residuals	bool	If True, residuals from the training data are used as proxy of prediction error to create predictions. If False, out of sample residuals (calibration) are used. Out-of-sample residuals must be precomputed using Forecaster's set_out_sample_residuals() method.	True
use_binned_residuals	bool	If True, residuals are selected based on the predicted values (binned selection). If False, residuals are selected randomly.	True
random_state	int	Seed for the random number generator to ensure reproducibility.	123
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the prediction process. See skforecast.exceptions.warn_skforecast_categories for more information.	False
levels	Ignored	Not used, present here for API consistency by convention.	None

Returns:

Name	Type	Description
predictions	pandas DataFrame	Long-format DataFrame with the quantiles predicted by the forecaster. For example, if quantiles = [0.05, 0.5, 0.95], the columns are level, q_0.05, q_0.5, q_0.95.

References

.. [1] Forecasting: Principles and Practice (3^rd ed) Rob J Hyndman and George Athanasopoulos. https://otexts.com/fpp3/prediction-intervals.html

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def predict_quantiles(
    self,
    steps: int | list[int] | None = None,
    last_window: pd.DataFrame | None = None,
    exog: pd.Series | pd.DataFrame | None = None,
    quantiles: list[float] | tuple[float] = [0.05, 0.5, 0.95],
    n_boot: int = 250,
    use_in_sample_residuals: bool = True,
    use_binned_residuals: bool = True,
    random_state: int = 123,
    suppress_warnings: bool = False,
    levels: Any = None
) -> pd.DataFrame:
    """
    Bootstrapping based predicted quantiles.

    Parameters
    ----------
    steps : int, list, None, default None
        Predict n steps. The value of `steps` must be less than or equal to the 
        value of steps defined when initializing the forecaster. Starts at 1.

        - If `int`: Only steps within the range of 1 to int are predicted.
        - If `list`: List of ints. Only the steps contained in the list 
        are predicted.
        - If `None`: As many steps are predicted as were defined at 
        initialization.
    last_window : pandas DataFrame, default None
        Series values used to create the predictors (lags) needed to 
        predict `steps`.
        If `last_window = None`, the values stored in` self.last_window_` are
        used to calculate the initial predictors, and the predictions start
        right after training data.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s.
    quantiles : list, tuple, default [0.05, 0.5, 0.95]
        Sequence of quantiles to compute, which must be between 0 and 1 
        inclusive. For example, quantiles of 0.05, 0.5 and 0.95 should be as 
        `quantiles = [0.05, 0.5, 0.95]`.
    n_boot : int, default 250
        Number of bootstrapping iterations to perform when estimating quantiles.
    use_in_sample_residuals : bool, default True
        If `True`, residuals from the training data are used as proxy of
        prediction error to create predictions. 
        If `False`, out of sample residuals (calibration) are used. 
        Out-of-sample residuals must be precomputed using Forecaster's
        `set_out_sample_residuals()` method.
    use_binned_residuals : bool, default True
        If `True`, residuals are selected based on the predicted values 
        (binned selection).
        If `False`, residuals are selected randomly.
    random_state : int, default 123
        Seed for the random number generator to ensure reproducibility.
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the prediction 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    levels : Ignored
        Not used, present here for API consistency by convention.

    Returns
    -------
    predictions : pandas DataFrame
        Long-format DataFrame with the quantiles predicted by the forecaster.
        For example, if `quantiles = [0.05, 0.5, 0.95]`, the columns are
        `level`, `q_0.05`, `q_0.5`, `q_0.95`.

    References
    ----------
    .. [1] Forecasting: Principles and Practice (3rd ed) Rob J Hyndman and George Athanasopoulos.
           https://otexts.com/fpp3/prediction-intervals.html

    """

    set_skforecast_warnings(suppress_warnings, action='ignore')

    check_interval(quantiles=quantiles)

    predictions = self.predict_bootstrapping(
                      steps                   = steps,
                      last_window             = last_window,
                      exog                    = exog,
                      n_boot                  = n_boot,
                      random_state            = random_state,
                      use_in_sample_residuals = use_in_sample_residuals,
                      use_binned_residuals    = use_binned_residuals
                  )

    quantiles_cols = [f'q_{q}' for q in quantiles]
    predictions[quantiles_cols] = (
        predictions.iloc[:, 1:].quantile(q=quantiles, axis=1).transpose()
    )
    predictions = predictions[['level'] + quantiles_cols]

    set_skforecast_warnings(suppress_warnings, action='default')

    return predictions

predict_dist

predict_dist(
    distribution,
    steps=None,
    last_window=None,
    exog=None,
    n_boot=250,
    use_in_sample_residuals=True,
    use_binned_residuals=True,
    random_state=123,
    suppress_warnings=False,
    levels=None,
)

Fit a given probability distribution for each step. After generating multiple forecasting predictions through a bootstrapping process, each step is fitted to the given distribution.

Parameters:

Name	Type	Description	Default
distribution	object	A distribution object from scipy.stats with methods _pdf and fit. For example scipy.stats.norm.	required
steps	(int, list, None)	Predict n steps. The value of steps must be less than or equal to the value of steps defined when initializing the forecaster. Starts at 1. If int: Only steps within the range of 1 to int are predicted. If list: List of ints. Only the steps contained in the list are predicted. If None: As many steps are predicted as were defined at initialization.	None
last_window	pandas DataFrame	Series values used to create the predictors (lags) needed to predict steps. If last_window = None, the values stored inself.last_window_ are used to calculate the initial predictors, and the predictions start right after training data.	None
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s.	None
n_boot	int	Number of bootstrapping iterations to perform when estimating prediction intervals.	250
use_in_sample_residuals	bool	If True, residuals from the training data are used as proxy of prediction error to create predictions. If False, out of sample residuals (calibration) are used. Out-of-sample residuals must be precomputed using Forecaster's set_out_sample_residuals() method.	True
use_binned_residuals	bool	If True, residuals are selected based on the predicted values (binned selection). If False, residuals are selected randomly.	True
random_state	int	Seed for the random number generator to ensure reproducibility.	123
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the prediction process. See skforecast.exceptions.warn_skforecast_categories for more information.	False
levels	Ignored	Not used, present here for API consistency by convention.	None

Returns:

Name	Type	Description
predictions	pandas DataFrame	Long-format DataFrame with the parameters of the fitted distribution for each step. The columns are level, param_0, param_1, ..., param_n, where param_i are the parameters of the distribution.

References

.. [1] Forecasting: Principles and Practice (3^rd ed) Rob J Hyndman and George Athanasopoulos. https://otexts.com/fpp3/prediction-intervals.html

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def predict_dist(
    self,
    distribution: object,
    steps: int | list[int] | None = None,
    last_window: pd.DataFrame | None = None,
    exog: pd.Series | pd.DataFrame | None = None,
    n_boot: int = 250,
    use_in_sample_residuals: bool = True,
    use_binned_residuals: bool = True,
    random_state: int = 123,
    suppress_warnings: bool = False,
    levels: Any = None
) -> pd.DataFrame:
    """
    Fit a given probability distribution for each step. After generating 
    multiple forecasting predictions through a bootstrapping process, each 
    step is fitted to the given distribution.

    Parameters
    ----------
    distribution : object
        A distribution object from scipy.stats with methods `_pdf` and `fit`. 
        For example scipy.stats.norm.
    steps : int, list, None, default None
        Predict n steps. The value of `steps` must be less than or equal to the 
        value of steps defined when initializing the forecaster. Starts at 1.

        - If `int`: Only steps within the range of 1 to int are predicted.
        - If `list`: List of ints. Only the steps contained in the list 
        are predicted.
        - If `None`: As many steps are predicted as were defined at 
        initialization.
    last_window : pandas DataFrame, default None
        Series values used to create the predictors (lags) needed to 
        predict `steps`.
        If `last_window = None`, the values stored in` self.last_window_` are
        used to calculate the initial predictors, and the predictions start
        right after training data.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s.
    n_boot : int, default 250
        Number of bootstrapping iterations to perform when estimating prediction
        intervals.
    use_in_sample_residuals : bool, default True
        If `True`, residuals from the training data are used as proxy of
        prediction error to create predictions. 
        If `False`, out of sample residuals (calibration) are used. 
        Out-of-sample residuals must be precomputed using Forecaster's
        `set_out_sample_residuals()` method.
    use_binned_residuals : bool, default True
        If `True`, residuals are selected based on the predicted values 
        (binned selection).
        If `False`, residuals are selected randomly.
    random_state : int, default 123
        Seed for the random number generator to ensure reproducibility.
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the prediction 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    levels : Ignored
        Not used, present here for API consistency by convention.

    Returns
    -------
    predictions : pandas DataFrame
        Long-format DataFrame with the parameters of the fitted distribution
        for each step. The columns are `level`, `param_0`, `param_1`, ..., 
        `param_n`, where `param_i` are the parameters of the distribution.

    References
    ----------
    .. [1] Forecasting: Principles and Practice (3rd ed) Rob J Hyndman and George Athanasopoulos.
           https://otexts.com/fpp3/prediction-intervals.html

    """

    if not hasattr(distribution, "_pdf") or not callable(getattr(distribution, "fit", None)):
        raise TypeError(
            "`distribution` must be a valid probability distribution object "
            "from scipy.stats, with methods `_pdf` and `fit`."
        )

    set_skforecast_warnings(suppress_warnings, action='ignore')

    predictions = self.predict_bootstrapping(
                      steps                   = steps,
                      last_window             = last_window,
                      exog                    = exog,
                      n_boot                  = n_boot,
                      random_state            = random_state,
                      use_in_sample_residuals = use_in_sample_residuals,
                      use_binned_residuals    = use_binned_residuals
                  )

    param_names = [
        p for p in inspect.signature(distribution._pdf).parameters if not p == "x"
    ] + ["loc", "scale"]

    predictions[param_names] = (
        predictions.iloc[:, 1:].apply(
            lambda x: distribution.fit(x), axis=1, result_type='expand'
        )
    )
    predictions = predictions[['level'] + param_names]

    set_skforecast_warnings(suppress_warnings, action='default')

    return predictions

set_params

set_params(params)

Set new values to the parameters of the scikit-learn model stored in the forecaster. It is important to note that all models share the same configuration of parameters and hyperparameters.

Parameters:

Name	Type	Description	Default
params	dict	Parameters values.	required

Returns:

Type	Description
None

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def set_params(
    self, 
    params: dict[str, object]
) -> None:
    """
    Set new values to the parameters of the scikit-learn model stored in the
    forecaster. It is important to note that all models share the same 
    configuration of parameters and hyperparameters.

    Parameters
    ----------
    params : dict
        Parameters values.

    Returns
    -------
    None

    """

    self.regressor = clone(self.regressor)
    self.regressor.set_params(**params)
    self.regressors_ = {step: clone(self.regressor)
                        for step in range(1, self.steps + 1)}

set_fit_kwargs

set_fit_kwargs(fit_kwargs)

Set new values for the additional keyword arguments passed to the fit method of the regressor.

Parameters:

Name	Type	Description	Default
fit_kwargs	dict	Dict of the form {"argument": new_value}.	required

Returns:

Type	Description
None

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def set_fit_kwargs(
    self, 
    fit_kwargs: dict[str, object]
) -> None:
    """
    Set new values for the additional keyword arguments passed to the `fit` 
    method of the regressor.

    Parameters
    ----------
    fit_kwargs : dict
        Dict of the form {"argument": new_value}.

    Returns
    -------
    None

    """

    self.fit_kwargs = check_select_fit_kwargs(self.regressor, fit_kwargs=fit_kwargs)

set_lags

set_lags(lags=None)

Set new value to the attribute lags. Attributes lags_names, max_lag and window_size are also updated.

Parameters:

Name	Type	Description	Default
lags	int, list, numpy ndarray, range, dict	Lags used as predictors. Index starts at 1, so lag 1 is equal to t-1. int: include lags from 1 to lags (included). list, 1d numpy ndarray or range: include only lags present in lags, all elements must be int. dict: create different lags for each series. {'series_column_name': lags}. None: no lags are included as predictors.	None

Returns:

Type	Description
None

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def set_lags(
    self, 
    lags: int | list[int] | np.ndarray[int] | range[int] | dict[str, int | list] | None = None,
) -> None:
    """
    Set new value to the attribute `lags`. Attributes `lags_names`, 
    `max_lag` and `window_size` are also updated.

    Parameters
    ----------
    lags : int, list, numpy ndarray, range, dict, default None
        Lags used as predictors. Index starts at 1, so lag 1 is equal to t-1.

        - `int`: include lags from 1 to `lags` (included).
        - `list`, `1d numpy ndarray` or `range`: include only lags present in 
        `lags`, all elements must be int.
        - `dict`: create different lags for each series. {'series_column_name': lags}.
        - `None`: no lags are included as predictors. 

    Returns
    -------
    None

    """

    if self.window_features is None and lags is None:
        raise ValueError(
            "At least one of the arguments `lags` or `window_features` "
            "must be different from None. This is required to create the "
            "predictors used in training the forecaster."
        )

    if isinstance(lags, dict):
        self.lags = {}
        self.lags_names = {}
        list_max_lags = []
        for key in lags:
            if lags[key] is None:
                self.lags[key] = None
                self.lags_names[key] = None
            else:
                self.lags[key], lags_names, max_lag = initialize_lags(
                    forecaster_name = type(self).__name__,
                    lags            = lags[key]
                )
                self.lags_names[key] = (
                    [f'{key}_{lag}' for lag in lags_names] 
                     if lags_names is not None 
                     else None
                )
                if max_lag is not None:
                    list_max_lags.append(max_lag)

        self.max_lag = max(list_max_lags) if len(list_max_lags) != 0 else None
    else:
        self.lags, self.lags_names, self.max_lag = initialize_lags(
            forecaster_name = type(self).__name__, 
            lags            = lags
        )

    # Repeated here in case of lags is a dict with all values as None
    if self.window_features is None and (lags is None or self.max_lag is None):
        raise ValueError(
            "At least one of the arguments `lags` or `window_features` "
            "must be different from None. This is required to create the "
            "predictors used in training the forecaster."
        )

    self.window_size = max(
        [ws for ws in [self.max_lag, self.max_size_window_features] 
         if ws is not None]
    )
    if self.differentiation is not None:
        self.window_size += self.differentiation
        self.differentiator.set_params(window_size=self.window_size)

set_window_features

set_window_features(window_features=None)

Set new value to the attribute window_features. Attributes max_size_window_features, window_features_names, window_features_class_names and window_size are also updated.

Parameters:

Name	Type	Description	Default
window_features	(object, list)	Instance or list of instances used to create window features. Window features are created from the original time series and are included as predictors.	None

Returns:

Type	Description
None

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def set_window_features(
    self, 
    window_features: object | list[object] | None = None
) -> None:
    """
    Set new value to the attribute `window_features`. Attributes 
    `max_size_window_features`, `window_features_names`, 
    `window_features_class_names` and `window_size` are also updated.

    Parameters
    ----------
    window_features : object, list, default None
        Instance or list of instances used to create window features. Window features
        are created from the original time series and are included as predictors.

    Returns
    -------
    None

    """

    if window_features is None and self.max_lag is None:
        raise ValueError(
            "At least one of the arguments `lags` or `window_features` "
            "must be different from None. This is required to create the "
            "predictors used in training the forecaster."
        )

    self.window_features, self.window_features_names, self.max_size_window_features = (
        initialize_window_features(window_features)
    )
    self.window_features_class_names = None
    if window_features is not None:
        self.window_features_class_names = [
            type(wf).__name__ for wf in self.window_features
        ] 
    self.window_size = max(
        [ws for ws in [self.max_lag, self.max_size_window_features] 
         if ws is not None]
    )
    if self.differentiation is not None:
        self.window_size += self.differentiation
        self.differentiator.set_params(window_size=self.window_size)

set_in_sample_residuals

set_in_sample_residuals(
    series,
    exog=None,
    random_state=123,
    suppress_warnings=False,
)

Set in-sample residuals in case they were not calculated during the training process.

In-sample residuals are calculated as the difference between the true values and the predictions made by the forecaster using the training data. The following internal attributes are updated:

• in_sample_residuals_: Dictionary containing a numpy ndarray with the residuals for each step in the form {step: residuals}.
• binner_intervals_: intervals used to bin the residuals are calculated using the quantiles of the predicted values.
• in_sample_residuals_by_bin_: residuals are binned according to the predicted value they are associated with and stored in a dictionary, where the keys are the intervals of the predicted values and the values are the residuals associated with that range.

A total of 10_000 residuals are stored in the attribute in_sample_residuals_. If the number of residuals is greater than 10_000, a random sample of 10_000 residuals is stored. The number of residuals stored per bin is limited to 10_000 // self.binner.n_bins_.

Parameters:

Name	Type	Description	Default
series	pandas DataFrame	Training time series.	required
exog	pandas Series, pandas DataFrame	Exogenous variable/s included as predictor/s. Must have the same number of observations as y and their indexes must be aligned so that y[i] is regressed on exog[i].	None
random_state	int	Sets a seed to the random sampling for reproducible output.	123
suppress_warnings	bool	If True, skforecast warnings will be suppressed during the sampling process. See skforecast.exceptions.warn_skforecast_categories for more information.	False

Returns:

Type	Description
None

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def set_in_sample_residuals(
    self,
    series: pd.DataFrame,
    exog: pd.Series | pd.DataFrame | None = None,
    random_state: int = 123,
    suppress_warnings: bool = False
) -> None:
    """
    Set in-sample residuals in case they were not calculated during the
    training process. 

    In-sample residuals are calculated as the difference between the true 
    values and the predictions made by the forecaster using the training 
    data. The following internal attributes are updated:

    + `in_sample_residuals_`: Dictionary containing a numpy ndarray with the
    residuals for each step in the form `{step: residuals}`.
    + `binner_intervals_`: intervals used to bin the residuals are calculated
    using the quantiles of the predicted values.
    + `in_sample_residuals_by_bin_`: residuals are binned according to the
    predicted value they are associated with and stored in a dictionary, where
    the keys are the intervals of the predicted values and the values are
    the residuals associated with that range. 

    A total of 10_000 residuals are stored in the attribute `in_sample_residuals_`.
    If the number of residuals is greater than 10_000, a random sample of
    10_000 residuals is stored. The number of residuals stored per bin is
    limited to `10_000 // self.binner.n_bins_`.

    Parameters
    ----------
    series : pandas DataFrame
        Training time series.
    exog : pandas Series, pandas DataFrame, default None
        Exogenous variable/s included as predictor/s. Must have the same
        number of observations as `y` and their indexes must be aligned so
        that y[i] is regressed on exog[i].
    random_state : int, default 123
        Sets a seed to the random sampling for reproducible output.
    suppress_warnings : bool, default False
        If `True`, skforecast warnings will be suppressed during the sampling 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.

    Returns
    -------
    None

    """

    set_skforecast_warnings(suppress_warnings, action='ignore')

    if not self.is_fitted:
        raise NotFittedError(
            "This forecaster is not fitted yet. Call `fit` with appropriate "
            "arguments before using `set_in_sample_residuals()`."
        )

    check_y(y=series[self.level])
    y_index_range = preprocess_y(
        y=series[self.level], return_values=False, suppress_warnings=True
    )[1][[0, -1]]
    if not y_index_range.equals(self.training_range_):
        raise IndexError(
            f"The index range of `series` does not match the range "
            f"used during training. Please ensure the index is aligned "
            f"with the training data.\n"
            f"    Expected : {self.training_range_}\n"
            f"    Received : {y_index_range}"
        )

    # NOTE: This attributes are modified in _create_train_X_y, store original values
    original_exog_in_ = self.exog_in_
    original_X_train_window_features_names_out_ = self.X_train_window_features_names_out_
    original_X_train_direct_exog_names_out_ = self.X_train_direct_exog_names_out_

    (
        X_train,
        y_train,
        _,
        _,
        _,
        _,
        X_train_features_names_out_,
        *_
    ) = self._create_train_X_y(series=series, exog=exog)

    if not X_train_features_names_out_ == self.X_train_features_names_out_:

        # NOTE: Reset attributes modified in _create_train_X_y to their original values
        self.exog_in_ = original_exog_in_
        self.X_train_window_features_names_out_ = original_X_train_window_features_names_out_
        self.X_train_direct_exog_names_out_ = original_X_train_direct_exog_names_out_

        raise ValueError(
            f"Feature mismatch detected after matrix creation. The features "
            f"generated from the provided data do not match those used during "
            f"the training process. To correctly set in-sample residuals, "
            f"ensure that the same data and preprocessing steps are applied.\n"
            f"    Expected output : {self.X_train_features_names_out_}\n"
            f"    Current output  : {X_train_features_names_out_}"
        )

    y_true_steps = []
    y_pred_steps = []
    self.in_sample_residuals_ = {}
    for step in range(1, self.steps + 1):

        X_train_step, y_train_step = self.filter_train_X_y_for_step(
                                         step          = step,
                                         X_train       = X_train,
                                         y_train       = y_train,
                                         remove_suffix = True
                                     )

        y_true_step = y_train_step.to_numpy()
        y_pred_step = self.regressors_[step].predict(X_train_step)
        residuals = y_true_step - y_pred_step
        if len(residuals) > 10_000:
            rng = np.random.default_rng(seed=random_state)
            residuals = residuals[
                rng.integers(low=0, high=len(residuals), size=10_000)
            ]

        y_true_steps.append(y_true_step)
        y_pred_steps.append(y_pred_step)
        self.in_sample_residuals_[step] = residuals

    self._binning_in_sample_residuals(
        y_true                    = np.concatenate(y_true_steps),
        y_pred                    = np.concatenate(y_pred_steps),
        store_in_sample_residuals = True,
        random_state              = random_state
    )

    # NOTE: Reset attributes modified in _create_train_X_y to their original values
    self.exog_in_ = original_exog_in_
    self.X_train_window_features_names_out_ = original_X_train_window_features_names_out_
    self.X_train_direct_exog_names_out_ = original_X_train_direct_exog_names_out_

    set_skforecast_warnings(suppress_warnings, action='default')

set_out_sample_residuals

set_out_sample_residuals(
    y_true, y_pred, append=False, random_state=123
)

Set new values to the attribute out_sample_residuals_. Out of sample residuals are meant to be calculated using observations that did not participate in the training process. y_true and y_pred are expected to be in the original scale of the time series. Residuals are calculated as y_true - y_pred, after applying the necessary transformations and differentiations if the forecaster includes them (self.transformer_series and self.differentiation).

A total of 10_000 residuals are stored in the attribute out_sample_residuals_. If the number of residuals is greater than 10_000, a random sample of 10_000 residuals is stored.

Parameters:

Name	Type	Description	Default
y_true	dict	Dictionary of numpy ndarrays or pandas Series with the true values of the time series for each model in the form {step: y_true}.	required
y_pred	dict	Dictionary of numpy ndarrays or pandas Series with the predicted values of the time series for each model in the form {step: y_pred}.	required
append	bool	If True, new residuals are added to the once already stored in the attribute out_sample_residuals_. If after appending the new residuals, the limit of 10_000 samples is exceeded, a random sample of 10_000 is kept.	False
random_state	int	Sets a seed to the random sampling for reproducible output.	123

Returns:

Type	Description
None

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def set_out_sample_residuals(
    self,
    y_true: dict[int, np.ndarray | pd.Series],
    y_pred: dict[int, np.ndarray | pd.Series],
    append: bool = False,
    random_state: int = 123
) -> None:
    """
    Set new values to the attribute `out_sample_residuals_`. Out of sample
    residuals are meant to be calculated using observations that did not
    participate in the training process. `y_true` and `y_pred` are expected
    to be in the original scale of the time series. Residuals are calculated
    as `y_true` - `y_pred`, after applying the necessary transformations and
    differentiations if the forecaster includes them (`self.transformer_series`
    and `self.differentiation`).

    A total of 10_000 residuals are stored in the attribute `out_sample_residuals_`.
    If the number of residuals is greater than 10_000, a random sample of
    10_000 residuals is stored.

    Parameters
    ----------
    y_true : dict
        Dictionary of numpy ndarrays or pandas Series with the true values of
        the time series for each model in the form {step: y_true}.
    y_pred : dict
        Dictionary of numpy ndarrays or pandas Series with the predicted values
        of the time series for each model in the form {step: y_pred}.
    append : bool, default False
        If `True`, new residuals are added to the once already stored in the
        attribute `out_sample_residuals_`. If after appending the new residuals,
        the limit of 10_000 samples is exceeded, a random sample of 10_000 is
        kept.
    random_state : int, default 123
        Sets a seed to the random sampling for reproducible output.

    Returns
    -------
    None

    """

    if not self.is_fitted:
        raise NotFittedError(
            "This forecaster is not fitted yet. Call `fit` with appropriate "
            "arguments before using `set_out_sample_residuals()`."
        )

    if not isinstance(y_true, dict):
        raise TypeError(
            f"`y_true` must be a dictionary of numpy ndarrays or pandas Series. "
            f"Got {type(y_true)}."
        )

    if not isinstance(y_pred, dict):
        raise TypeError(
            f"`y_pred` must be a dictionary of numpy ndarrays or pandas Series. "
            f"Got {type(y_pred)}."
        )

    if not set(y_true.keys()) == set(y_pred.keys()):
        raise ValueError(
            f"`y_true` and `y_pred` must have the same keys. "
            f"Got {set(y_true.keys())} and {set(y_pred.keys())}."
        )

    for k in y_true.keys():
        if not isinstance(y_true[k], (np.ndarray, pd.Series)):
            raise TypeError(
                f"Values of `y_true` must be numpy ndarrays or pandas Series. "
                f"Got {type(y_true[k])} for step {k}."
            )
        if not isinstance(y_pred[k], (np.ndarray, pd.Series)):
            raise TypeError(
                f"Values of `y_pred` must be numpy ndarrays or pandas Series. "
                f"Got {type(y_pred[k])} for step {k}."
            )
        if len(y_true[k]) != len(y_pred[k]):
            raise ValueError(
                f"`y_true` and `y_pred` must have the same length. "
                f"Got {len(y_true[k])} and {len(y_pred[k])} for step {k}."
            )
        if isinstance(y_true[k], pd.Series) and isinstance(y_pred[k], pd.Series):
            if not y_true[k].index.equals(y_pred[k].index):
                raise ValueError(
                    f"When containing pandas Series, elements in `y_true` and "
                    f"`y_pred` must have the same index. Error in step {k}."
                )

    if self.out_sample_residuals_ is None:
        self.out_sample_residuals_ = {
            step: None for step in range(1, self.steps + 1)
        }

    steps_to_update = set(range(1, self.steps + 1)).intersection(set(y_pred.keys()))
    if not steps_to_update:
        raise ValueError(
            "Provided keys in `y_pred` and `y_true` do not match any step. "
            "Residuals cannot be updated."
        )

    y_true = deepcopy(y_true)
    y_pred = deepcopy(y_pred)
    if self.differentiation is not None:
        differentiator = copy(self.differentiator)
        differentiator.set_params(window_size=None)

    residuals = {}
    for step in steps_to_update:
        if isinstance(y_true[step], pd.Series):
            y_true[step] = y_true[step].to_numpy()
        if isinstance(y_pred[step], pd.Series):
            y_pred[step] = y_pred[step].to_numpy()
        if self.transformer_series:
            y_true[step] = transform_numpy(
                               array             = y_true[step],
                               transformer       = self.transformer_series_[self.level],
                               fit               = False,
                               inverse_transform = False
                           )
            y_pred[step] = transform_numpy(
                               array             = y_pred[step],
                               transformer       = self.transformer_series_[self.level],
                               fit               = False,
                               inverse_transform = False
                           )
        if self.differentiation is not None:
            y_true[step] = differentiator.fit_transform(y_true[step])[self.differentiation:]
            y_pred[step] = differentiator.fit_transform(y_pred[step])[self.differentiation:]

        residuals[step] = y_true[step] - y_pred[step]

    y_true = np.concatenate(list(y_true.values()))
    y_pred = np.concatenate(list(y_pred.values()))
    data = pd.DataFrame(
        {'prediction': y_pred, 'residuals': y_true - y_pred}
    ).dropna()
    y_pred = data['prediction'].to_numpy()
    residuals_all_steps = data['residuals'].to_numpy()

    data['bin'] = self.binner.transform(y_pred).astype(int)
    residuals_by_bin = data.groupby('bin')['residuals'].apply(np.array).to_dict()

    out_sample_residuals = (
        {step: None for step in range(1, self.steps + 1)}
        if self.out_sample_residuals_ is None
        else self.out_sample_residuals_
    )

    rng = np.random.default_rng(seed=random_state)
    for step, residuals_step in residuals.items():
        if append and out_sample_residuals[step] is not None:
            out_sample_residuals_step = np.concatenate(
                [out_sample_residuals[step], residuals_step]
            )
        else:
            out_sample_residuals_step = residuals_step

        if len(out_sample_residuals_step) > 10_000:
            out_sample_residuals_step = rng.choice(
                out_sample_residuals_step, size=10_000, replace=False
            )

        out_sample_residuals[step] = out_sample_residuals_step

    out_sample_residuals_by_bin = (
        {} 
        if self.out_sample_residuals_by_bin_ is None
        else self.out_sample_residuals_by_bin_
    )
    if append:
        for k, v in residuals_by_bin.items():
            if k in out_sample_residuals_by_bin:
                out_sample_residuals_by_bin[k] = np.concatenate(
                    (out_sample_residuals_by_bin[k], v)
                )
            else:
                out_sample_residuals_by_bin[k] = v
    else:
        out_sample_residuals_by_bin = residuals_by_bin

    max_samples = 10_000 // self.binner.n_bins_
    for k, v in out_sample_residuals_by_bin.items():
        if len(v) > max_samples:
            sample = rng.choice(a=v, size=max_samples, replace=False)
            out_sample_residuals_by_bin[k] = sample

    bin_keys = (
        []
        if self.binner_intervals_ is None
        else self.binner_intervals_.keys()
    )
    for k in bin_keys:
        if k not in out_sample_residuals_by_bin:
            out_sample_residuals_by_bin[k] = np.array([])

    empty_bins = [
        k for k, v in out_sample_residuals_by_bin.items() 
        if v.size == 0
    ]
    if empty_bins:
        warnings.warn(
            f"The following bins have no out of sample residuals: {empty_bins}. "
            f"No predicted values fall in the interval "
            f"{[self.binner_intervals_[bin] for bin in empty_bins]}. "
            f"Empty bins will be filled with a random sample of residuals.",
            ResidualsUsageWarning
        )
        for k in empty_bins:
            out_sample_residuals_by_bin[k] = rng.choice(
                a       = residuals_all_steps,
                size    = min(max_samples, len(residuals_all_steps)),
                replace = False
            )

    self.out_sample_residuals_ = out_sample_residuals
    self.out_sample_residuals_by_bin_ = out_sample_residuals_by_bin

get_feature_importances

get_feature_importances(step, sort_importance=True)

Return feature importance of the model stored in the forecaster for a specific step. Since a separate model is created for each forecast time step, it is necessary to select the model from which retrieve information. Only valid when regressor stores internally the feature importances in the attribute feature_importances_ or coef_. Otherwise, it returns
None.

Parameters:

Name	Type	Description	Default
step	int	Model from which retrieve information (a separate model is created for each forecast time step). First step is 1.	required
sort_importance	bool	If True, sorts the feature importances in descending order.	True

Returns:

Name	Type	Description
feature_importances	pandas DataFrame	Feature importances associated with each predictor.

Source code in skforecast\direct\_forecaster_direct_multivariate.py

def get_feature_importances(
    self,
    step: int,
    sort_importance: bool = True
) -> pd.DataFrame:
    """
    Return feature importance of the model stored in the forecaster for a
    specific step. Since a separate model is created for each forecast time
    step, it is necessary to select the model from which retrieve information.
    Only valid when regressor stores internally the feature importances in
    the attribute `feature_importances_` or `coef_`. Otherwise, it returns  
    `None`.

    Parameters
    ----------
    step : int
        Model from which retrieve information (a separate model is created 
        for each forecast time step). First step is 1.
    sort_importance: bool, default True
        If `True`, sorts the feature importances in descending order.

    Returns
    -------
    feature_importances : pandas DataFrame
        Feature importances associated with each predictor.

    """

    if not isinstance(step, int):
        raise TypeError(
            f"`step` must be an integer. Got {type(step)}."
        )

    if not self.is_fitted:
        raise NotFittedError(
            "This forecaster is not fitted yet. Call `fit` with appropriate "
            "arguments before using `get_feature_importances()`."
        )

    if (step < 1) or (step > self.steps):
        raise ValueError(
            f"The step must have a value from 1 to the maximum number of steps "
            f"({self.steps}). Got {step}."
        )

    if isinstance(self.regressor, Pipeline):
        estimator = self.regressors_[step][-1]
    else:
        estimator = self.regressors_[step]

    n_lags = len(list(
        chain(*[v for v in self.lags_.values() if v is not None])
    ))
    n_window_features = (
        len(self.X_train_window_features_names_out_) if self.window_features is not None else 0
    )
    idx_columns_autoreg = np.arange(n_lags + n_window_features)
    if self.exog_in_:
        idx_columns_exog = np.flatnonzero(
                               [name.endswith(f"step_{step}")
                                for name in self.X_train_features_names_out_]
                           )
    else:
        idx_columns_exog = np.array([], dtype=int)

    idx_columns = np.concatenate((idx_columns_autoreg, idx_columns_exog))
    idx_columns = [int(x) for x in idx_columns]  # Required since numpy 2.0
    feature_names = [
        self.X_train_features_names_out_[i].replace(f"_step_{step}", "") 
        for i in idx_columns
    ]

    if hasattr(estimator, 'feature_importances_'):
        feature_importances = estimator.feature_importances_
    elif hasattr(estimator, 'coef_'):
        feature_importances = estimator.coef_
    else:
        warnings.warn(
            f"Impossible to access feature importances for regressor of type "
            f"{type(estimator)}. This method is only valid when the "
            f"regressor stores internally the feature importances in the "
            f"attribute `feature_importances_` or `coef_`."
        )
        feature_importances = None

    if feature_importances is not None:
        feature_importances = pd.DataFrame({
                                  'feature': feature_names,
                                  'importance': feature_importances
                              })
        if sort_importance:
            feature_importances = feature_importances.sort_values(
                                      by='importance', ascending=False
                                  )

    return feature_importances