`model_selection_multiseries`¶

`backtesting_forecaster_multiseries(forecaster, series, steps, metric, initial_train_size, fixed_train_size=True, gap=0, allow_incomplete_fold=True, levels=None, exog=None, refit=False, interval=None, n_boot=500, random_state=123, in_sample_residuals=True, n_jobs='auto', verbose=False, show_progress=True, suppress_warnings=False)` ¶

Backtesting for multi-series and multivariate forecasters.

If refit is False, the model will be trained only once using the initial_train_size first observations.
If refit is True, the model is trained on each iteration, increasing the training set.
If refit is an integer, the model will be trained every that number of iterations.
If forecaster is already trained and initial_train_size is None, no initial train will be done and all data will be used to evaluate the model. However, the first len(forecaster.last_window) observations are needed to create the initial predictors, so no predictions are calculated for them.

A copy of the original forecaster is created so that it is not modified during the process.

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate, ForecasterRnn)`	Forecaster model.	required
`series`	`pandas DataFrame, dict`	Training time series.	required
`steps`	`int`	Number of steps to predict.	required
`metric`	`(str, Callable, list)`	Metric used to quantify the goodness of fit of the model. If `string`: {'mean_squared_error', 'mean_absolute_error', 'mean_absolute_percentage_error', 'mean_squared_log_error'} If `Callable`: Function with arguments y_true, y_pred that returns a float. If `list`: List containing multiple strings and/or Callables.	required
`initial_train_size`	`int`	Number of samples in the initial train split. If `None` and `forecaster` is already trained, no initial train is done and all data is used to evaluate the model. However, the first `len(forecaster.last_window)` observations are needed to create the initial predictors, so no predictions are calculated for them. This useful to backtest the model on the same data used to train it. `None` is only allowed when `refit` is `False` and `forecaster` is already trained.	`None`
`fixed_train_size`	`bool`	If True, train size doesn't increase but moves by `steps` in each iteration.	`True`
`gap`	`int`	Number of samples to be excluded after the end of each training set and before the test set.	`0`
`allow_incomplete_fold`	`bool`	Last fold is allowed to have a smaller number of samples than the `test_size`. If `False`, the last fold is excluded.	`True`
`levels`	`(str, list)`	Time series to be predicted. If `None` all levels will be predicted.	`None`
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`refit`	`(bool, int)`	Whether to re-fit the forecaster in each iteration. If `refit` is an integer, the Forecaster will be trained every that number of iterations.	`False`
`interval`	`list`	Confidence of the prediction interval estimated. Sequence of percentiles to compute, which must be between 0 and 100 inclusive. If `None`, no intervals are estimated.	`None`
`n_boot`	`int`	Number of bootstrapping iterations used to estimate prediction intervals.	`500`
`random_state`	`int`	Sets a seed to the random generator, so that boot intervals are always deterministic.	`123`
`in_sample_residuals`	`bool`	If `True`, residuals from the training data are used as proxy of prediction error to create prediction intervals. If `False`, out_sample_residuals are used if they are already stored inside the forecaster.	`True`
`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_backtesting. New in version 0.9.0	`'auto'`
`verbose`	`bool`	Print number of folds and index of training and validation sets used for backtesting.	`False`
`show_progress`	`bool`	Whether to show a progress bar.	`True`
`suppress_warnings`	`bool`	If `True`, skforecast warnings will be suppressed during the backtesting process. See skforecast.exceptions.warn_skforecast_categories for more information.	`False`

Returns:

Name	Type	Description
`metrics_levels`	`pandas DataFrame`	Value(s) of the metric(s). Index are the levels and columns the metrics.
`backtest_predictions`	`pandas DataFrame`	Value of predictions and their estimated interval if `interval` is not `None`. If there is more than one level, this structure will be repeated for each of them. column pred: predictions. column lower_bound: lower bound of the interval. column upper_bound: upper bound of the interval.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def backtesting_forecaster_multiseries(
    forecaster: object,
    series: Union[pd.DataFrame, dict],
    steps: int,
    metric: Union[str, Callable, list],
    initial_train_size: Optional[int],
    fixed_train_size: bool=True,
    gap: int=0,
    allow_incomplete_fold: bool=True,
    levels: Optional[Union[str, list]]=None,
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    refit: Union[bool, int]=False,
    interval: Optional[list]=None,
    n_boot: int=500,
    random_state: int=123,
    in_sample_residuals: bool=True,
    n_jobs: Union[int, str]='auto',
    verbose: bool=False,
    show_progress: bool=True,
    suppress_warnings: bool=False
) -> Tuple[pd.DataFrame, pd.DataFrame]:
    """
    Backtesting for multi-series and multivariate forecasters.

    - If `refit` is `False`, the model will be trained only once using the 
    `initial_train_size` first observations. 
    - If `refit` is `True`, the model is trained on each iteration, increasing
    the training set. 
    - If `refit` is an `integer`, the model will be trained every that number 
    of iterations.
    - If `forecaster` is already trained and `initial_train_size` is `None`,
    no initial train will be done and all data will be used to evaluate the model.
    However, the first `len(forecaster.last_window)` observations are needed
    to create the initial predictors, so no predictions are calculated for them.

    A copy of the original forecaster is created so that it is not modified during 
    the process.

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate, ForecasterRnn
        Forecaster model.
    series : pandas DataFrame, dict
        Training time series.
    steps : int
        Number of steps to predict.
    metric : str, Callable, list
        Metric used to quantify the goodness of fit of the model.

        - If `string`: {'mean_squared_error', 'mean_absolute_error',
        'mean_absolute_percentage_error', 'mean_squared_log_error'}
        - If `Callable`: Function with arguments y_true, y_pred that returns 
        a float.
        - If `list`: List containing multiple strings and/or Callables.
    initial_train_size : int, default `None`
        Number of samples in the initial train split. If `None` and `forecaster` is 
        already trained, no initial train is done and all data is used to evaluate the 
        model. However, the first `len(forecaster.last_window)` observations are needed 
        to create the initial predictors, so no predictions are calculated for them. 
        This useful to backtest the model on the same data used to train it.
        `None` is only allowed when `refit` is `False` and `forecaster` is already
        trained.
    fixed_train_size : bool, default `True`
        If True, train size doesn't increase but moves by `steps` in each iteration.
    gap : int, default `0`
        Number of samples to be excluded after the end of each training set and 
        before the test set.
    allow_incomplete_fold : bool, default `True`
        Last fold is allowed to have a smaller number of samples than the 
        `test_size`. If `False`, the last fold is excluded.
    levels : str, list, default `None`
        Time series to be predicted. If `None` all levels will be predicted.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    refit : bool, int, default `False`
        Whether to re-fit the forecaster in each iteration. If `refit` is an 
        integer, the Forecaster will be trained every that number of iterations.
    interval : list, default `None`
        Confidence of the prediction interval estimated. Sequence of percentiles
        to compute, which must be between 0 and 100 inclusive. If `None`, no
        intervals are estimated.
    n_boot : int, default `500`
        Number of bootstrapping iterations used to estimate prediction
        intervals.
    random_state : int, default `123`
        Sets a seed to the random generator, so that boot intervals are always 
        deterministic.
    in_sample_residuals : bool, default `True`
        If `True`, residuals from the training data are used as proxy of prediction 
        error to create prediction intervals. If `False`, out_sample_residuals 
        are used if they are already stored inside the forecaster.
    n_jobs : int, 'auto', default `'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_backtesting.
        **New in version 0.9.0**
    verbose : bool, default `False`
        Print number of folds and index of training and validation sets used 
        for backtesting.
    show_progress : bool, default `True`
        Whether to show a progress bar.
    suppress_warnings: bool, default `False`
        If `True`, skforecast warnings will be suppressed during the backtesting 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.

    Returns
    -------
    metrics_levels : pandas DataFrame
        Value(s) of the metric(s). Index are the levels and columns the metrics.
    backtest_predictions : pandas DataFrame
        Value of predictions and their estimated interval if `interval` is not `None`.
        If there is more than one level, this structure will be repeated for each of them.

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

    """

    multi_series_forecasters = [
        'ForecasterAutoregMultiSeries', 
        'ForecasterAutoregMultiSeriesCustom', 
        'ForecasterAutoregMultiVariate',
        'ForecasterRnn'
    ]

    forecaster_name = type(forecaster).__name__

    if forecaster_name not in multi_series_forecasters:
        raise TypeError(
            (f"`forecaster` must be of type {multi_series_forecasters}, "
             f"for all other types of forecasters use the functions available in "
             f"the `model_selection` module. Got {forecaster_name}")
        )

    check_backtesting_input(
        forecaster            = forecaster,
        steps                 = steps,
        metric                = metric,
        series                = series,
        exog                  = exog,
        initial_train_size    = initial_train_size,
        fixed_train_size      = fixed_train_size,
        gap                   = gap,
        allow_incomplete_fold = allow_incomplete_fold,
        refit                 = refit,
        interval              = interval,
        n_boot                = n_boot,
        random_state          = random_state,
        in_sample_residuals   = in_sample_residuals,
        n_jobs                = n_jobs,
        verbose               = verbose,
        show_progress         = show_progress,
        suppress_warnings     = suppress_warnings
    )

    metrics_levels, backtest_predictions = _backtesting_forecaster_multiseries(
        forecaster            = forecaster,
        series                = series,
        steps                 = steps,
        levels                = levels,
        metric                = metric,
        initial_train_size    = initial_train_size,
        fixed_train_size      = fixed_train_size,
        gap                   = gap,
        allow_incomplete_fold = allow_incomplete_fold,
        exog                  = exog,
        refit                 = refit,
        interval              = interval,
        n_boot                = n_boot,
        random_state          = random_state,
        in_sample_residuals   = in_sample_residuals,
        n_jobs                = n_jobs,
        verbose               = verbose,
        show_progress         = show_progress,
        suppress_warnings     = suppress_warnings
    )

    return metrics_levels, backtest_predictions

`grid_search_forecaster_multiseries(forecaster, series, param_grid, steps, metric, initial_train_size, fixed_train_size=True, gap=0, allow_incomplete_fold=True, levels=None, exog=None, lags_grid=None, refit=False, return_best=True, n_jobs='auto', verbose=True, show_progress=True, suppress_warnings=False, output_file=None)` ¶

Exhaustive search over specified parameter values for a Forecaster object. Validation is done using multi-series backtesting.

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate)`	Forecaster model.	required
`series`	`pandas DataFrame, dict`	Training time series.	required
`param_grid`	`dict`	Dictionary with parameters names (`str`) as keys and lists of parameter settings to try as values.	required
`steps`	`int`	Number of steps to predict.	required
`metric`	`(str, Callable, list)`	Metric used to quantify the goodness of fit of the model. If `string`: {'mean_squared_error', 'mean_absolute_error', 'mean_absolute_percentage_error', 'mean_squared_log_error'} If `Callable`: Function with arguments y_true, y_pred that returns a float. If `list`: List containing multiple strings and/or Callables.	required
`initial_train_size`	`int`	Number of samples in the initial train split.	required
`fixed_train_size`	`bool`	If True, train size doesn't increase but moves by `steps` in each iteration.	`True`
`gap`	`int`	Number of samples to be excluded after the end of each training set and before the test set.	`0`
`allow_incomplete_fold`	`bool`	Last fold is allowed to have a smaller number of samples than the `test_size`. If `False`, the last fold is excluded.	`True`
`levels`	`(str, list)`	level (`str`) or levels (`list`) at which the forecaster is optimized. If `None`, all levels are taken into account. The resulting metric will be the average of the optimization of all levels.	`None`
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`lags_grid`	`(list, dict)`	Lists of lags to try, containing int, lists, numpy ndarray, or range objects. If `dict`, the keys are used as labels in the `results` DataFrame, and the values are used as the lists of lags to try. Ignored if the forecaster is an instance of `ForecasterAutoregCustom` or `ForecasterAutoregMultiSeriesCustom`.	`None`
`refit`	`(bool, int)`	Whether to re-fit the forecaster in each iteration. If `refit` is an integer, the Forecaster will be trained every that number of iterations.	`False`
`return_best`	`bool`	Refit the `forecaster` using the best found parameters on the whole data.	`True`
`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_backtesting. New in version 0.9.0	`'auto'`
`verbose`	`bool`	Print number of folds used for cv or backtesting.	`True`
`show_progress`	`bool`	Whether to show a progress bar.	`True`
`suppress_warnings`	`bool`	If `True`, skforecast warnings will be suppressed during the hyperparameter search. See skforecast.exceptions.warn_skforecast_categories for more information.	`False`
`output_file`	`str`	Specifies the filename or full path where the results should be saved. The results will be saved in a tab-separated values (TSV) format. If `None`, the results will not be saved to a file. New in version 0.12.0	`None`

Returns:

Name	Type	Description
`results`	`pandas DataFrame`	Results for each combination of parameters. column levels: levels configuration for each iteration. column lags: lags configuration for each iteration. column lags_label: descriptive label or alias for the lags. column params: parameters configuration for each iteration. column metric: metric value estimated for each iteration. The resulting metric will be the average of the optimization of all levels. additional n columns with param = value.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def grid_search_forecaster_multiseries(
    forecaster: object,
    series: Union[pd.DataFrame, dict],
    param_grid: dict,
    steps: int,
    metric: Union[str, Callable, list],
    initial_train_size: int,
    fixed_train_size: bool=True,
    gap: int=0,
    allow_incomplete_fold: bool=True,
    levels: Optional[Union[str, list]]=None,
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    lags_grid: Optional[Union[list, dict]]=None,
    refit: Union[bool, int]=False,
    return_best: bool=True,
    n_jobs: Union[int, str]='auto',
    verbose: bool=True,
    show_progress: bool=True,
    suppress_warnings: bool=False,
    output_file: Optional[str]=None
) -> pd.DataFrame:
    """
    Exhaustive search over specified parameter values for a Forecaster object.
    Validation is done using multi-series backtesting.

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate
        Forecaster model.
    series : pandas DataFrame, dict
        Training time series.
    param_grid : dict
        Dictionary with parameters names (`str`) as keys and lists of parameter
        settings to try as values.
    steps : int
        Number of steps to predict.
    metric : str, Callable, list
        Metric used to quantify the goodness of fit of the model.

        - If `string`: {'mean_squared_error', 'mean_absolute_error',
        'mean_absolute_percentage_error', 'mean_squared_log_error'}
        - If `Callable`: Function with arguments y_true, y_pred that returns 
        a float.
        - If `list`: List containing multiple strings and/or Callables.
    initial_train_size : int 
        Number of samples in the initial train split.
    fixed_train_size : bool, default `True`
        If True, train size doesn't increase but moves by `steps` in each iteration.
    gap : int, default `0`
        Number of samples to be excluded after the end of each training set and 
        before the test set.
    allow_incomplete_fold : bool, default `True`
        Last fold is allowed to have a smaller number of samples than the 
        `test_size`. If `False`, the last fold is excluded.
    levels : str, list, default `None`
        level (`str`) or levels (`list`) at which the forecaster is optimized. 
        If `None`, all levels are taken into account. The resulting metric will be
        the average of the optimization of all levels.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    lags_grid : list, dict, default `None`
        Lists of lags to try, containing int, lists, numpy ndarray, or range 
        objects. If `dict`, the keys are used as labels in the `results` 
        DataFrame, and the values are used as the lists of lags to try. Ignored 
        if the forecaster is an instance of `ForecasterAutoregCustom` or 
        `ForecasterAutoregMultiSeriesCustom`.
    refit : bool, int, default `False`
        Whether to re-fit the forecaster in each iteration. If `refit` is an 
        integer, the Forecaster will be trained every that number of iterations.
    return_best : bool, default `True`
        Refit the `forecaster` using the best found parameters on the whole data.
    n_jobs : int, 'auto', default `'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_backtesting.
        **New in version 0.9.0**
    verbose : bool, default `True`
        Print number of folds used for cv or backtesting.
    show_progress : bool, default `True`
        Whether to show a progress bar.
    suppress_warnings: bool, default `False`
        If `True`, skforecast warnings will be suppressed during the hyperparameter 
        search. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    output_file : str, default `None`
        Specifies the filename or full path where the results should be saved. 
        The results will be saved in a tab-separated values (TSV) format. If 
        `None`, the results will not be saved to a file.
        **New in version 0.12.0**

    Returns
    -------
    results : pandas DataFrame
        Results for each combination of parameters.

        - column levels: levels configuration for each iteration.
        - column lags: lags configuration for each iteration.
        - column lags_label: descriptive label or alias for the lags.
        - column params: parameters configuration for each iteration.
        - column metric: metric value estimated for each iteration. The resulting 
        metric will be the average of the optimization of all levels.
        - additional n columns with param = value.

    """

    param_grid = list(ParameterGrid(param_grid))

    results = _evaluate_grid_hyperparameters_multiseries(
                  forecaster            = forecaster,
                  series                = series,
                  param_grid            = param_grid,
                  steps                 = steps,
                  metric                = metric,
                  initial_train_size    = initial_train_size,
                  fixed_train_size      = fixed_train_size,
                  gap                   = gap,
                  allow_incomplete_fold = allow_incomplete_fold,
                  levels                = levels,
                  exog                  = exog,
                  lags_grid             = lags_grid,
                  refit                 = refit,
                  n_jobs                = n_jobs,
                  return_best           = return_best,
                  verbose               = verbose,
                  show_progress         = show_progress,
                  suppress_warnings     = suppress_warnings,
                  output_file           = output_file
              )

    return results

`random_search_forecaster_multiseries(forecaster, series, param_distributions, steps, metric, initial_train_size, fixed_train_size=True, gap=0, allow_incomplete_fold=True, levels=None, exog=None, lags_grid=None, refit=False, n_iter=10, random_state=123, return_best=True, n_jobs='auto', verbose=True, show_progress=True, suppress_warnings=False, output_file=None)` ¶

Random search over specified parameter values or distributions for a Forecaster object. Validation is done using multi-series backtesting.

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate)`	Forecaster model.	required
`series`	`pandas DataFrame, dict`	Training time series.	required
`param_distributions`	`dict`	Dictionary with parameters names (`str`) as keys and distributions or lists of parameters to try.	required
`steps`	`int`	Number of steps to predict.	required
`metric`	`(str, Callable, list)`	Metric used to quantify the goodness of fit of the model. If `string`: {'mean_squared_error', 'mean_absolute_error', 'mean_absolute_percentage_error', 'mean_squared_log_error'} If `Callable`: Function with arguments y_true, y_pred that returns a float. If `list`: List containing multiple strings and/or Callables.	required
`initial_train_size`	`int`	Number of samples in the initial train split.	required
`fixed_train_size`	`bool`	If True, train size doesn't increase but moves by `steps` in each iteration.	`True`
`gap`	`int`	Number of samples to be excluded after the end of each training set and before the test set.	`0`
`allow_incomplete_fold`	`bool`	Last fold is allowed to have a smaller number of samples than the `test_size`. If `False`, the last fold is excluded.	`True`
`levels`	`(str, list)`	level (`str`) or levels (`list`) at which the forecaster is optimized. If `None`, all levels are taken into account. The resulting metric will be the average of the optimization of all levels.	`None`
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`lags_grid`	`(list, dict)`	Lists of lags to try, containing int, lists, numpy ndarray, or range objects. If `dict`, the keys are used as labels in the `results` DataFrame, and the values are used as the lists of lags to try. Ignored if the forecaster is an instance of `ForecasterAutoregCustom` or `ForecasterAutoregMultiSeriesCustom`.	`None`
`refit`	`(bool, int)`	Whether to re-fit the forecaster in each iteration. If `refit` is an integer, the Forecaster will be trained every that number of iterations.	`False`
`n_iter`	`int`	Number of parameter settings that are sampled per lags configuration. n_iter trades off runtime vs quality of the solution.	`10`
`random_state`	`int`	Sets a seed to the random sampling for reproducible output.	`123`
`return_best`	`bool`	Refit the `forecaster` using the best found parameters on the whole data.	`True`
`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_backtesting. New in version 0.9.0	`'auto'`
`verbose`	`bool`	Print number of folds used for cv or backtesting.	`True`
`show_progress`	`bool`	Whether to show a progress bar.	`True`
`suppress_warnings`	`bool`	If `True`, skforecast warnings will be suppressed during the hyperparameter search. See skforecast.exceptions.warn_skforecast_categories for more information.	`False`
`output_file`	`str`	Specifies the filename or full path where the results should be saved. The results will be saved in a tab-separated values (TSV) format. If `None`, the results will not be saved to a file. New in version 0.12.0	`None`

Returns:

Name	Type	Description
`results`	`pandas DataFrame`	Results for each combination of parameters. column levels: levels configuration for each iteration. column lags: lags configuration for each iteration. column lags_label: descriptive label or alias for the lags. column params: parameters configuration for each iteration. column metric: metric value estimated for each iteration. The resulting metric will be the average of the optimization of all levels. additional n columns with param = value.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def random_search_forecaster_multiseries(
    forecaster: object,
    series: Union[pd.DataFrame, dict],
    param_distributions: dict,
    steps: int,
    metric: Union[str, Callable, list],
    initial_train_size: int,
    fixed_train_size: bool=True,
    gap: int=0,
    allow_incomplete_fold: bool=True,
    levels: Optional[Union[str, list]]=None,
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    lags_grid: Optional[Union[list, dict]]=None,
    refit: Union[bool, int]=False,
    n_iter: int=10,
    random_state: int=123,
    return_best: bool=True,
    n_jobs: Union[int, str]='auto',
    verbose: bool=True,
    show_progress: bool=True,
    suppress_warnings: bool=False,
    output_file: Optional[str]=None
) -> pd.DataFrame:
    """
    Random search over specified parameter values or distributions for a Forecaster 
    object. Validation is done using multi-series backtesting.

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate
        Forecaster model.
    series : pandas DataFrame, dict
        Training time series.
    param_distributions : dict
        Dictionary with parameters names (`str`) as keys and distributions or 
        lists of parameters to try.
    steps : int
        Number of steps to predict.
    metric : str, Callable, list
        Metric used to quantify the goodness of fit of the model.

        - If `string`: {'mean_squared_error', 'mean_absolute_error',
        'mean_absolute_percentage_error', 'mean_squared_log_error'}
        - If `Callable`: Function with arguments y_true, y_pred that returns 
        a float.
        - If `list`: List containing multiple strings and/or Callables.
    initial_train_size : int 
        Number of samples in the initial train split.
    fixed_train_size : bool, default `True`
        If True, train size doesn't increase but moves by `steps` in each iteration.
    gap : int, default `0`
        Number of samples to be excluded after the end of each training set and 
        before the test set.
    allow_incomplete_fold : bool, default `True`
        Last fold is allowed to have a smaller number of samples than the 
        `test_size`. If `False`, the last fold is excluded.
    levels : str, list, default `None`
        level (`str`) or levels (`list`) at which the forecaster is optimized. 
        If `None`, all levels are taken into account. The resulting metric will be
        the average of the optimization of all levels.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    lags_grid : list, dict, default `None`
        Lists of lags to try, containing int, lists, numpy ndarray, or range 
        objects. If `dict`, the keys are used as labels in the `results` 
        DataFrame, and the values are used as the lists of lags to try. Ignored 
        if the forecaster is an instance of `ForecasterAutoregCustom` or 
        `ForecasterAutoregMultiSeriesCustom`.
    refit : bool, int, default `False`
        Whether to re-fit the forecaster in each iteration. If `refit` is an 
        integer, the Forecaster will be trained every that number of iterations.
    n_iter : int, default `10`
        Number of parameter settings that are sampled per lags configuration. 
        n_iter trades off runtime vs quality of the solution.
    random_state : int, default `123`
        Sets a seed to the random sampling for reproducible output.
    return_best : bool, default `True`
        Refit the `forecaster` using the best found parameters on the whole data.
    n_jobs : int, 'auto', default `'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_backtesting.
        **New in version 0.9.0**
    verbose : bool, default `True`
        Print number of folds used for cv or backtesting.
    show_progress : bool, default `True`
        Whether to show a progress bar.
    suppress_warnings: bool, default `False`
        If `True`, skforecast warnings will be suppressed during the hyperparameter 
        search. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    output_file : str, default `None`
        Specifies the filename or full path where the results should be saved. 
        The results will be saved in a tab-separated values (TSV) format. If 
        `None`, the results will not be saved to a file.
        **New in version 0.12.0**

    Returns
    -------
    results : pandas DataFrame
        Results for each combination of parameters.

        - column levels: levels configuration for each iteration.
        - column lags: lags configuration for each iteration.
        - column lags_label: descriptive label or alias for the lags.
        - column params: parameters configuration for each iteration.
        - column metric: metric value estimated for each iteration. The resulting 
        metric will be the average of the optimization of all levels.
        - additional n columns with param = value.

    """

    param_grid = list(ParameterSampler(param_distributions, n_iter=n_iter, 
                                       random_state=random_state))

    results = _evaluate_grid_hyperparameters_multiseries(
                  forecaster            = forecaster,
                  series                = series,
                  param_grid            = param_grid,
                  steps                 = steps,
                  metric                = metric,
                  initial_train_size    = initial_train_size,
                  fixed_train_size      = fixed_train_size,
                  gap                   = gap,
                  allow_incomplete_fold = allow_incomplete_fold,
                  levels                = levels,
                  exog                  = exog,
                  lags_grid             = lags_grid,
                  refit                 = refit,
                  return_best           = return_best,
                  n_jobs                = n_jobs,
                  verbose               = verbose,
                  show_progress         = show_progress,
                  suppress_warnings     = suppress_warnings,
                 output_file            = output_file
              )

    return results

`bayesian_search_forecaster_multiseries(forecaster, series, search_space, steps, metric, initial_train_size, fixed_train_size=True, gap=0, allow_incomplete_fold=True, levels=None, exog=None, lags_grid='deprecated', refit=False, n_trials=10, random_state=123, return_best=True, n_jobs='auto', verbose=True, show_progress=True, suppress_warnings=False, output_file=None, engine='optuna', kwargs_create_study={}, kwargs_study_optimize={})` ¶

Bayesian optimization for a Forecaster object using multi-series backtesting and optuna library. New in version 0.12.0

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate)`	Forecaster model.	required
`series`	`pandas DataFrame, dict`	Training time series.	required
`search_space`	`Callable`	Function with argument `trial` which returns a dictionary with parameters names (`str`) as keys and Trial object from optuna (trial.suggest_float, trial.suggest_int, trial.suggest_categorical) as values.	required
`steps`	`int`	Number of steps to predict.	required
`metric`	`(str, Callable, list)`	Metric used to quantify the goodness of fit of the model. If `string`: {'mean_squared_error', 'mean_absolute_error', 'mean_absolute_percentage_error', 'mean_squared_log_error'} If `Callable`: Function with arguments y_true, y_pred that returns a float. If `list`: List containing multiple strings and/or Callables.	required
`initial_train_size`	`int`	Number of samples in the initial train split.	required
`fixed_train_size`	`bool`	If True, train size doesn't increase but moves by `steps` in each iteration.	`True`
`gap`	`int`	Number of samples to be excluded after the end of each training set and before the test set.	`0`
`allow_incomplete_fold`	`bool`	Last fold is allowed to have a smaller number of samples than the `test_size`. If `False`, the last fold is excluded.	`True`
`levels`	`(str, list)`	level (`str`) or levels (`list`) at which the forecaster is optimized. If `None`, all levels are taken into account. The resulting metric will be the average of the optimization of all levels.	`None`
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`lags_grid`	`deprecated`	Deprecated since version 0.12.0 and will be removed in 0.13.0. Use `search_space` to define the candidate values for the lags. This allows the lags to be optimized along with the other hyperparameters of the regressor in the bayesian search.	`'deprecated'`
`refit`	`(bool, int)`	Whether to re-fit the forecaster in each iteration. If `refit` is an integer, the Forecaster will be trained every that number of iterations.	`False`
`n_trials`	`int`	Number of parameter settings that are sampled in each lag configuration.	`10`
`random_state`	`int`	Sets a seed to the sampling for reproducible output.	`123`
`return_best`	`bool`	Refit the `forecaster` using the best found parameters on the whole data.	`True`
`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_backtesting.	`'auto'`
`verbose`	`bool`	Print number of folds used for cv or backtesting.	`True`
`show_progress`	`bool`	Whether to show a progress bar.	`True`
`suppress_warnings`	`bool`	If `True`, skforecast warnings will be suppressed during the hyperparameter search. See skforecast.exceptions.warn_skforecast_categories for more information.	`False`
`output_file`	`str`	Specifies the filename or full path where the results should be saved. The results will be saved in a tab-separated values (TSV) format. If `None`, the results will not be saved to a file. New in version 0.12.0	`None`
`engine`	`str`	Bayesian optimization runs through the optuna library.	`'optuna'`
`kwargs_create_study`	`dict`	Keyword arguments (key, value mappings) to pass to optuna.create_study(). If default, the direction is set to 'minimize' and a TPESampler(seed=123) sampler is used during optimization.	`{}`
`kwargs_study_optimize`	`dict`	Other keyword arguments (key, value mappings) to pass to study.optimize().	`{}`

Returns:

Name	Type	Description
`results`	`pandas DataFrame`	Results for each combination of parameters. column levels: levels configuration for each iteration. column lags: lags configuration for each iteration. column params: parameters configuration for each iteration. column metric: metric value estimated for each iteration. The resulting metric will be the average of the optimization of all levels. additional n columns with param = value.
`best_trial`	`optuna object`	The best optimization result returned as a FrozenTrial optuna object.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def bayesian_search_forecaster_multiseries(
    forecaster: object,
    series: Union[pd.DataFrame, dict],
    search_space: Callable,
    steps: int,
    metric: Union[str, Callable, list],
    initial_train_size: int,
    fixed_train_size: bool=True,
    gap: int=0,
    allow_incomplete_fold: bool=True,
    levels: Optional[Union[str, list]]=None,
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    lags_grid: Any='deprecated',
    refit: Union[bool, int]=False,
    n_trials: int=10,
    random_state: int=123,
    return_best: bool=True,
    n_jobs: Union[int, str]='auto',
    verbose: bool=True,
    show_progress: bool=True,
    suppress_warnings: bool=False,
    output_file: Optional[str]=None,
    engine: str='optuna',
    kwargs_create_study: dict={},
    kwargs_study_optimize: dict={}
) -> Tuple[pd.DataFrame, object]:
    """
    Bayesian optimization for a Forecaster object using multi-series backtesting 
    and optuna library.
    **New in version 0.12.0**

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate
        Forecaster model.
    series : pandas DataFrame, dict
        Training time series.
    search_space : Callable
        Function with argument `trial` which returns a dictionary with parameters names 
        (`str`) as keys and Trial object from optuna (trial.suggest_float, 
        trial.suggest_int, trial.suggest_categorical) as values.
    steps : int
        Number of steps to predict.
    metric : str, Callable, list
        Metric used to quantify the goodness of fit of the model.

        - If `string`: {'mean_squared_error', 'mean_absolute_error',
        'mean_absolute_percentage_error', 'mean_squared_log_error'}
        - If `Callable`: Function with arguments y_true, y_pred that returns 
        a float.
        - If `list`: List containing multiple strings and/or Callables.
    initial_train_size : int 
        Number of samples in the initial train split.
    fixed_train_size : bool, default `True`
        If True, train size doesn't increase but moves by `steps` in each iteration.
    gap : int, default `0`
        Number of samples to be excluded after the end of each training set and 
        before the test set.
    allow_incomplete_fold : bool, default `True`
        Last fold is allowed to have a smaller number of samples than the 
        `test_size`. If `False`, the last fold is excluded.
    levels : str, list, default `None`
        level (`str`) or levels (`list`) at which the forecaster is optimized. 
        If `None`, all levels are taken into account. The resulting metric will be
        the average of the optimization of all levels.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    lags_grid : deprecated
        **Deprecated since version 0.12.0 and will be removed in 0.13.0.** Use
        `search_space` to define the candidate values for the lags. This allows 
        the lags to be optimized along with the other hyperparameters of the 
        regressor in the bayesian search.
    refit : bool, int, default `False`
        Whether to re-fit the forecaster in each iteration. If `refit` is an 
        integer, the Forecaster will be trained every that number of iterations.
    n_trials : int, default `10`
        Number of parameter settings that are sampled in each lag configuration.
    random_state : int, default `123`
        Sets a seed to the sampling for reproducible output.
    return_best : bool, default `True`
        Refit the `forecaster` using the best found parameters on the whole data.
    n_jobs : int, 'auto', default `'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_backtesting.
    verbose : bool, default `True`
        Print number of folds used for cv or backtesting.
    show_progress : bool, default `True`
        Whether to show a progress bar.
    suppress_warnings: bool, default `False`
        If `True`, skforecast warnings will be suppressed during the hyperparameter
        search. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    output_file : str, default `None`
        Specifies the filename or full path where the results should be saved. 
        The results will be saved in a tab-separated values (TSV) format. If 
        `None`, the results will not be saved to a file.
        **New in version 0.12.0**
    engine : str, default `'optuna'`
        Bayesian optimization runs through the optuna library.
    kwargs_create_study : dict, default `{}`
        Keyword arguments (key, value mappings) to pass to optuna.create_study().
        If default, the direction is set to 'minimize' and a TPESampler(seed=123) 
        sampler is used during optimization.
    kwargs_study_optimize : dict, default `{}`
        Other keyword arguments (key, value mappings) to pass to study.optimize().

    Returns
    -------
    results : pandas DataFrame
        Results for each combination of parameters.

        - column levels: levels configuration for each iteration.
        - column lags: lags configuration for each iteration.
        - column params: parameters configuration for each iteration.
        - column metric: metric value estimated for each iteration. The resulting 
        metric will be the average of the optimization of all levels.
        - additional n columns with param = value.
    best_trial : optuna object
        The best optimization result returned as a FrozenTrial optuna object.

    """

    if return_best and exog is not None and (len(exog) != len(series)):
        raise ValueError(
            (f"`exog` must have same number of samples as `series`. "
             f"length `exog`: ({len(exog)}), length `series`: ({len(series)})")
        )

    if lags_grid != 'deprecated':
        warnings.warn(
            ("The 'lags_grid' argument is deprecated and will be removed in a future version. "
             "Use the 'search_space' argument to define the candidate values for the lags. "
             "Example: {'lags' : trial.suggest_categorical('lags', [3, 5])}")
        )
        lags_grid = 'deprecated'

    if engine not in ['optuna']:
        raise ValueError(
            f"`engine` only allows 'optuna', got {engine}."
        )

    results, best_trial = _bayesian_search_optuna_multiseries(
                              forecaster            = forecaster,
                              series                = series,
                              exog                  = exog,
                              levels                = levels, 
                              search_space          = search_space,
                              steps                 = steps,
                              metric                = metric,
                              refit                 = refit,
                              initial_train_size    = initial_train_size,
                              fixed_train_size      = fixed_train_size,
                              gap                   = gap,
                              allow_incomplete_fold = allow_incomplete_fold,
                              n_trials              = n_trials,
                              random_state          = random_state,
                              return_best           = return_best,
                              n_jobs                = n_jobs,
                              verbose               = verbose,
                              show_progress         = show_progress,
                              suppress_warnings     = suppress_warnings,
                              output_file           = output_file,
                              kwargs_create_study   = kwargs_create_study,
                              kwargs_study_optimize = kwargs_study_optimize
                          )

    return results, best_trial

`select_features_multiseries(forecaster, selector, series, exog=None, select_only=None, force_inclusion=None, subsample=0.5, random_state=123, verbose=True)` ¶

Feature selection using any of the sklearn.feature_selection module selectors (such as RFECV, SelectFromModel, etc.). Two groups of features are evaluated: autoregressive features and exogenous features. By default, the selection process is performed on both sets of features at the same time, so that the most relevant autoregressive and exogenous features are selected. However, using the select_only argument, the selection process can focus only on the autoregressive or exogenous features without taking into account the other features. Therefore, all other features will remain in the model. It is also possible to force the inclusion of certain features in the final list of selected features using the force_inclusion parameter.

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiseriesCustom)`	Forecaster model.	required
`selector`	`object`	A feature selector from sklearn.feature_selection.	required
`series`	`pandas DataFrame`	Target time series to which the feature selection will be applied.	required
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`select_only`	`str`	Decide what type of features to include in the selection process. If `'autoreg'`, only autoregressive features (lags or custom predictors) are evaluated by the selector. All exogenous features are included in the output (`selected_exog`). If `'exog'`, only exogenous features are evaluated without the presence of autoregressive features. All autoregressive features are included in the output (`selected_autoreg`). If `None`, all features are evaluated by the selector.	`None`
`force_inclusion`	`(list, str)`	Features to force include in the final list of selected features. If `list`, list of feature names to force include. If `str`, regular expression to identify features to force include. For example, if `force_inclusion="^sun_"`, all features that begin with "sun_" will be included in the final list of selected features.	`None`
`subsample`	`(int, float)`	Proportion of records to use for feature selection.	`0.5`
`random_state`	`int`	Sets a seed for the random subsample so that the subsampling process is always deterministic.	`123`
`verbose`	`bool`	Print information about feature selection process.	`True`

Returns:

Name	Type	Description
`selected_autoreg`	`list`	List of selected autoregressive features.
`selected_exog`	`list`	List of selected exogenous features.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def select_features_multiseries(
    forecaster: object,
    selector: object,
    series: Union[pd.DataFrame, dict],
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    select_only: Optional[str]=None,
    force_inclusion: Optional[Union[list, str]]=None,
    subsample: Union[int, float]=0.5,
    random_state: int=123,
    verbose: bool=True,
) -> Union[list, list]:
    """
    Feature selection using any of the sklearn.feature_selection module selectors 
    (such as `RFECV`, `SelectFromModel`, etc.). Two groups of features are
    evaluated: autoregressive features and exogenous features. By default, the 
    selection process is performed on both sets of features at the same time, 
    so that the most relevant autoregressive and exogenous features are selected. 
    However, using the `select_only` argument, the selection process can focus 
    only on the autoregressive or exogenous features without taking into account 
    the other features. Therefore, all other features will remain in the model. 
    It is also possible to force the inclusion of certain features in the final 
    list of selected features using the `force_inclusion` parameter.

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiseriesCustom
        Forecaster model.
    selector : object
        A feature selector from sklearn.feature_selection.
    series : pandas DataFrame
        Target time series to which the feature selection will be applied.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    select_only : str, default `None`
        Decide what type of features to include in the selection process. 

        - If `'autoreg'`, only autoregressive features (lags or custom 
        predictors) are evaluated by the selector. All exogenous features are 
        included in the output (`selected_exog`).
        - If `'exog'`, only exogenous features are evaluated without the presence
        of autoregressive features. All autoregressive features are included 
        in the output (`selected_autoreg`).
        - If `None`, all features are evaluated by the selector.
    force_inclusion : list, str, default `None`
        Features to force include in the final list of selected features.

        - If `list`, list of feature names to force include.
        - If `str`, regular expression to identify features to force include. 
        For example, if `force_inclusion="^sun_"`, all features that begin 
        with "sun_" will be included in the final list of selected features.
    subsample : int, float, default `0.5`
        Proportion of records to use for feature selection.
    random_state : int, default `123`
        Sets a seed for the random subsample so that the subsampling process 
        is always deterministic.
    verbose : bool, default `True`
        Print information about feature selection process.

    Returns
    -------
    selected_autoreg : list
        List of selected autoregressive features.
    selected_exog : list
        List of selected exogenous features.

    """

    valid_forecasters = [
        'ForecasterAutoregMultiSeries',
        'ForecasterAutoregMultiSeriesCustom',
    ]

    if type(forecaster).__name__ not in valid_forecasters:
        raise TypeError(
            f"`forecaster` must be one of the following classes: {valid_forecasters}."
        )

    if select_only not in ['autoreg', 'exog', None]:
        raise ValueError(
            "`select_only` must be one of the following values: 'autoreg', 'exog', None."
        )

    if subsample <= 0 or subsample > 1:
        raise ValueError(
            "`subsample` must be a number greater than 0 and less than or equal to 1."
        )

    forecaster = deepcopy(forecaster)
    forecaster.fitted = False
    output = forecaster._create_train_X_y(series=series, exog=exog)
    X_train = output[0]
    y_train = output[1]
    series_col_names = output[3]

    if forecaster.encoding == 'onehot':
        encoding_cols = series_col_names
    else:
        encoding_cols = ['_level_skforecast']

    if hasattr(forecaster, 'lags'):
        autoreg_cols = [f"lag_{lag}" for lag in forecaster.lags]
    else:
        if forecaster.name_predictors is not None:
            autoreg_cols = forecaster.name_predictors
        else:
            autoreg_cols = [
                col
                for col in X_train.columns
                if re.match(r'^custom_predictor_\d+', col)
            ]
    exog_cols = [
        col
        for col in X_train.columns
        if col not in autoreg_cols and col not in encoding_cols
    ]

    forced_autoreg = []
    forced_exog = []
    if force_inclusion is not None:
        if isinstance(force_inclusion, list):
            forced_autoreg = [col for col in force_inclusion if col in autoreg_cols]
            forced_exog = [col for col in force_inclusion if col in exog_cols]
        elif isinstance(force_inclusion, str):
            forced_autoreg = [col for col in autoreg_cols if re.match(force_inclusion, col)]
            forced_exog = [col for col in exog_cols if re.match(force_inclusion, col)]

    if select_only == 'autoreg':
        X_train = X_train.drop(columns=exog_cols + encoding_cols)
    elif select_only == 'exog':
        X_train = X_train.drop(columns=autoreg_cols + encoding_cols)
    else:
        X_train = X_train.drop(columns=encoding_cols)

    if isinstance(subsample, float):
        subsample = int(len(X_train)*subsample)

    rng = np.random.default_rng(seed=random_state)
    sample = rng.choice(X_train.index, size=subsample, replace=False)
    X_train_sample = X_train.loc[sample, :]
    y_train_sample = y_train.loc[sample]
    selector.fit(X_train_sample, y_train_sample)
    selected_features = selector.get_feature_names_out()

    if select_only == 'exog':
        selected_autoreg = autoreg_cols
    else:
        selected_autoreg = [
            feature
            for feature in selected_features
            if feature in autoreg_cols
        ]

    if select_only == 'autoreg':
        selected_exog = exog_cols
    else:
        selected_exog = [
            feature
            for feature in selected_features
            if feature in exog_cols
        ]

    if force_inclusion is not None: 
        if select_only != 'autoreg':
            forced_exog_not_selected = set(forced_exog) - set(selected_features)
            selected_exog.extend(forced_exog_not_selected)
            selected_exog.sort(key=exog_cols.index)
        if select_only != 'exog':
            forced_autoreg_not_selected = set(forced_autoreg) - set(selected_features)
            selected_autoreg.extend(forced_autoreg_not_selected)
            selected_autoreg.sort(key=autoreg_cols.index)

    if len(selected_autoreg) == 0:
        warnings.warn(
            ("No autoregressive features have been selected. Since a Forecaster "
             "cannot be created without them, be sure to include at least one "
             "using the `force_inclusion` parameter.")
        )
    else:
        if hasattr(forecaster, 'lags'):
            selected_autoreg = [int(feature.replace('lag_', '')) 
                                for feature in selected_autoreg] 

    if verbose:
        print(f"Recursive feature elimination ({selector.__class__.__name__})")
        print("--------------------------------" + "-"*len(selector.__class__.__name__))
        print(f"Total number of records available: {X_train.shape[0]}")
        print(f"Total number of records used for feature selection: {X_train_sample.shape[0]}")
        print(f"Number of features available: {len(autoreg_cols) + len(exog_cols)}") 
        print(f"    Autoreg (n={len(autoreg_cols)})")
        print(f"    Exog    (n={len(exog_cols)})")
        print(f"Number of features selected: {len(selected_features)}")
        print(f"    Autoreg (n={len(selected_autoreg)}) : {selected_autoreg}")
        print(f"    Exog    (n={len(selected_exog)}) : {selected_exog}")

    return selected_autoreg, selected_exog

`backtesting_forecaster_multivariate(forecaster, series, steps, metric, initial_train_size, fixed_train_size=True, gap=0, allow_incomplete_fold=True, levels=None, exog=None, refit=False, interval=None, n_boot=500, random_state=123, in_sample_residuals=True, n_jobs='auto', verbose=False, show_progress=True, suppress_warnings=False)` ¶

This function is an alias of backtesting_forecaster_multiseries.

Backtesting for multi-series and multivariate forecasters.

If refit is False, the model is trained only once using the initial_train_size first observations. If refit is True, the model is trained in each iteration increasing the training set. A copy of the original forecaster is created so it is not modified during the process.

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate)`	Forecaster model.	required
`series`	`pandas DataFrame, dict`	Training time series.	required
`steps`	`int`	Number of steps to predict.	required
`metric`	`(str, Callable, list)`	Metric used to quantify the goodness of fit of the model. If `string`: {'mean_squared_error', 'mean_absolute_error', 'mean_absolute_percentage_error', 'mean_squared_log_error'} If `Callable`: Function with arguments y_true, y_pred that returns a float. If `list`: List containing multiple strings and/or Callables.	required
`initial_train_size`	`int`	Number of samples in the initial train split. If `None` and `forecaster` is already trained, no initial train is done and all data is used to evaluate the model. However, the first `len(forecaster.last_window)` observations are needed to create the initial predictors, so no predictions are calculated for them. This useful to backtest the model on the same data used to train it. `None` is only allowed when `refit` is `False` and `forecaster` is already trained.	`None`
`fixed_train_size`	`bool`	If True, train size doesn't increase but moves by `steps` in each iteration.	`True`
`gap`	`int`	Number of samples to be excluded after the end of each training set and before the test set.	`0`
`allow_incomplete_fold`	`bool`	Last fold is allowed to have a smaller number of samples than the `test_size`. If `False`, the last fold is excluded.	`True`
`levels`	`(str, list)`	Time series to be predicted. If `None` all levels will be predicted.	`None`
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`refit`	`(bool, int)`	Whether to re-fit the forecaster in each iteration. If `refit` is an integer, the Forecaster will be trained every that number of iterations.	`False`
`interval`	`list`	Confidence of the prediction interval estimated. Sequence of percentiles to compute, which must be between 0 and 100 inclusive. If `None`, no intervals are estimated.	`None`
`n_boot`	`int`	Number of bootstrapping iterations used to estimate prediction intervals.	`500`
`random_state`	`int`	Sets a seed to the random generator, so that boot intervals are always deterministic.	`123`
`in_sample_residuals`	`bool`	If `True`, residuals from the training data are used as proxy of prediction error to create prediction intervals. If `False`, out_sample_residuals are used if they are already stored inside the forecaster.	`True`
`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_backtesting. New in version 0.9.0	`'auto'`
`verbose`	`bool`	Print number of folds and index of training and validation sets used for backtesting.	`False`
`show_progress`	`bool`	Whether to show a progress bar.	`True`
`suppress_warnings`	`bool`	If `True`, skforecast warnings will be suppressed during the backtesting process. See skforecast.exceptions.warn_skforecast_categories for more information.	`False`

Returns:

Name	Type	Description
`metrics_levels`	`pandas DataFrame`	Value(s) of the metric(s). Index are the levels and columns the metrics.
`backtest_predictions`	`pandas DataFrame`	Value of predictions and their estimated interval if `interval` is not `None`. If there is more than one level, this structure will be repeated for each of them. column pred: predictions. column lower_bound: lower bound of the interval. column upper_bound: upper bound of the interval.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def backtesting_forecaster_multivariate(
    forecaster: object,
    series: Union[pd.DataFrame, dict],
    steps: int,
    metric: Union[str, Callable, list],
    initial_train_size: Optional[int],
    fixed_train_size: bool=True,
    gap: int=0,
    allow_incomplete_fold: bool=True,
    levels: Optional[Union[str, list]]=None,
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    refit: Union[bool, int]=False,
    interval: Optional[list]=None,
    n_boot: int=500,
    random_state: int=123,
    in_sample_residuals: bool=True,
    n_jobs: Union[int, str]='auto',
    verbose: bool=False,
    show_progress: bool=True,
    suppress_warnings: bool=False
) -> Tuple[pd.DataFrame, pd.DataFrame]:
    """
    This function is an alias of backtesting_forecaster_multiseries.

    Backtesting for multi-series and multivariate forecasters.

    If `refit` is False, the model is trained only once using the `initial_train_size`
    first observations. If `refit` is True, the model is trained in each iteration
    increasing the training set. A copy of the original forecaster is created so 
    it is not modified during the process.

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate
        Forecaster model.
    series : pandas DataFrame, dict
        Training time series.
    steps : int
        Number of steps to predict.
    metric : str, Callable, list
        Metric used to quantify the goodness of fit of the model.

        - If `string`: {'mean_squared_error', 'mean_absolute_error',
        'mean_absolute_percentage_error', 'mean_squared_log_error'}
        - If `Callable`: Function with arguments y_true, y_pred that returns 
        a float.
        - If `list`: List containing multiple strings and/or Callables.
    initial_train_size : int, default `None`
        Number of samples in the initial train split. If `None` and `forecaster` is 
        already trained, no initial train is done and all data is used to evaluate the 
        model. However, the first `len(forecaster.last_window)` observations are needed 
        to create the initial predictors, so no predictions are calculated for them. 
        This useful to backtest the model on the same data used to train it.
        `None` is only allowed when `refit` is `False` and `forecaster` is already
        trained.
    fixed_train_size : bool, default `True`
        If True, train size doesn't increase but moves by `steps` in each iteration.
    gap : int, default `0`
        Number of samples to be excluded after the end of each training set and 
        before the test set.
    allow_incomplete_fold : bool, default `True`
        Last fold is allowed to have a smaller number of samples than the 
        `test_size`. If `False`, the last fold is excluded.
    levels : str, list, default `None`
        Time series to be predicted. If `None` all levels will be predicted.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    refit : bool, int, default `False`
        Whether to re-fit the forecaster in each iteration. If `refit` is an 
        integer, the Forecaster will be trained every that number of iterations.
    interval : list, default `None`
        Confidence of the prediction interval estimated. Sequence of percentiles
        to compute, which must be between 0 and 100 inclusive. If `None`, no
        intervals are estimated.
    n_boot : int, default `500`
        Number of bootstrapping iterations used to estimate prediction
        intervals.
    random_state : int, default `123`
        Sets a seed to the random generator, so that boot intervals are always 
        deterministic.
    in_sample_residuals : bool, default `True`
        If `True`, residuals from the training data are used as proxy of prediction 
        error to create prediction intervals.  If `False`, out_sample_residuals 
        are used if they are already stored inside the forecaster.
    n_jobs : int, 'auto', default `'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_backtesting.
        **New in version 0.9.0** 
    verbose : bool, default `False`
        Print number of folds and index of training and validation sets used 
        for backtesting.
    show_progress : bool, default `True`
        Whether to show a progress bar.
    suppress_warnings: bool, default `False`
        If `True`, skforecast warnings will be suppressed during the backtesting 
        process. See skforecast.exceptions.warn_skforecast_categories for more
        information.

    Returns
    -------
    metrics_levels : pandas DataFrame
        Value(s) of the metric(s). Index are the levels and columns the metrics.
    backtest_predictions : pandas DataFrame
        Value of predictions and their estimated interval if `interval` is not `None`.
        If there is more than one level, this structure will be repeated for each of them.

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

    """

    metrics_levels, backtest_predictions = backtesting_forecaster_multiseries(
        forecaster            = forecaster,
        series                = series,
        steps                 = steps,
        metric                = metric,
        initial_train_size    = initial_train_size,
        fixed_train_size      = fixed_train_size,
        gap                   = gap,
        allow_incomplete_fold = allow_incomplete_fold,
        levels                = levels,
        exog                  = exog,
        refit                 = refit,
        interval              = interval,
        n_boot                = n_boot,
        random_state          = random_state,
        in_sample_residuals   = in_sample_residuals,
        n_jobs                = n_jobs,
        verbose               = verbose,
        show_progress         = show_progress,
        suppress_warnings     = suppress_warnings
    )

    return metrics_levels, backtest_predictions

`grid_search_forecaster_multivariate(forecaster, series, param_grid, steps, metric, initial_train_size, fixed_train_size=True, gap=0, allow_incomplete_fold=True, levels=None, exog=None, lags_grid=None, refit=False, return_best=True, n_jobs='auto', verbose=True, show_progress=True, suppress_warnings=False, output_file=None)` ¶

This function is an alias of grid_search_forecaster_multiseries.

Exhaustive search over specified parameter values for a Forecaster object. Validation is done using multi-series backtesting.

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate)`	Forecaster model.	required
`series`	`pandas DataFrame, dict`	Training time series.	required
`param_grid`	`dict`	Dictionary with parameters names (`str`) as keys and lists of parameter settings to try as values.	required
`steps`	`int`	Number of steps to predict.	required
`metric`	`(str, Callable, list)`	Metric used to quantify the goodness of fit of the model. If `string`: {'mean_squared_error', 'mean_absolute_error', 'mean_absolute_percentage_error', 'mean_squared_log_error'} If `Callable`: Function with arguments y_true, y_pred that returns a float. If `list`: List containing multiple strings and/or Callables.	required
`initial_train_size`	`int`	Number of samples in the initial train split.	required
`fixed_train_size`	`bool`	If True, train size doesn't increase but moves by `steps` in each iteration.	`True`
`gap`	`int`	Number of samples to be excluded after the end of each training set and before the test set.	`0`
`allow_incomplete_fold`	`bool`	Last fold is allowed to have a smaller number of samples than the `test_size`. If `False`, the last fold is excluded.	`True`
`levels`	`(str, list)`	level (`str`) or levels (`list`) at which the forecaster is optimized. If `None`, all levels are taken into account. The resulting metric will be the average of the optimization of all levels.	`None`
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`lags_grid`	`(list, dict)`	Lists of lags to try, containing int, lists, numpy ndarray, or range objects. If `dict`, the keys are used as labels in the `results` DataFrame, and the values are used as the lists of lags to try. Ignored if the forecaster is an instance of `ForecasterAutoregCustom` or `ForecasterAutoregMultiSeriesCustom`.	`None`
`refit`	`(bool, int)`	Whether to re-fit the forecaster in each iteration. If `refit` is an integer, the Forecaster will be trained every that number of iterations.	`False`
`return_best`	`bool`	Refit the `forecaster` using the best found parameters on the whole data.	`True`
`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_backtesting. New in version 0.9.0	`'auto'`
`verbose`	`bool`	Print number of folds used for cv or backtesting.	`True`
`show_progress`	`bool`	Whether to show a progress bar.	`True`
`suppress_warnings`	`bool`	If `True`, skforecast warnings will be suppressed during the hyperparameter search. See skforecast.exceptions.warn_skforecast_categories for more information.	`False`
`output_file`	`str`	Specifies the filename or full path where the results should be saved. The results will be saved in a tab-separated values (TSV) format. If `None`, the results will not be saved to a file. New in version 0.12.0	`None`

Returns:

Name	Type	Description
`results`	`pandas DataFrame`	Results for each combination of parameters. column levels: levels configuration for each iteration. column lags: lags configuration for each iteration. column lags_label: descriptive label or alias for the lags. column params: parameters configuration for each iteration. column metric: metric value estimated for each iteration. The resulting metric will be the average of the optimization of all levels. additional n columns with param = value.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def grid_search_forecaster_multivariate(
    forecaster: object,
    series: Union[pd.DataFrame, dict],
    param_grid: dict,
    steps: int,
    metric: Union[str, Callable, list],
    initial_train_size: int,
    fixed_train_size: bool=True,
    gap: int=0,
    allow_incomplete_fold: bool=True,
    levels: Optional[Union[str, list]]=None,
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    lags_grid: Optional[Union[list, dict]]=None,
    refit: Union[bool, int]=False,
    return_best: bool=True,
    n_jobs: Union[int, str]='auto',
    verbose: bool=True,
    show_progress: bool=True,
    suppress_warnings: bool=False,
    output_file: Optional[str]=None
) -> pd.DataFrame:
    """
    This function is an alias of grid_search_forecaster_multiseries.

    Exhaustive search over specified parameter values for a Forecaster object.
    Validation is done using multi-series backtesting.

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate
        Forecaster model.
    series : pandas DataFrame, dict
        Training time series.
    param_grid : dict
        Dictionary with parameters names (`str`) as keys and lists of parameter
        settings to try as values.
    steps : int
        Number of steps to predict.
    metric : str, Callable, list
        Metric used to quantify the goodness of fit of the model.

        - If `string`: {'mean_squared_error', 'mean_absolute_error',
        'mean_absolute_percentage_error', 'mean_squared_log_error'}
        - If `Callable`: Function with arguments y_true, y_pred that returns 
        a float.
        - If `list`: List containing multiple strings and/or Callables.
    initial_train_size : int 
        Number of samples in the initial train split.
    fixed_train_size : bool, default `True`
        If True, train size doesn't increase but moves by `steps` in each iteration.
    gap : int, default `0`
        Number of samples to be excluded after the end of each training set and 
        before the test set.
    allow_incomplete_fold : bool, default `True`
        Last fold is allowed to have a smaller number of samples than the 
        `test_size`. If `False`, the last fold is excluded.
    levels : str, list, default `None`
        level (`str`) or levels (`list`) at which the forecaster is optimized. 
        If `None`, all levels are taken into account. The resulting metric will be
        the average of the optimization of all levels.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    lags_grid : list, dict, default `None`
        Lists of lags to try, containing int, lists, numpy ndarray, or range 
        objects. If `dict`, the keys are used as labels in the `results` 
        DataFrame, and the values are used as the lists of lags to try. Ignored 
        if the forecaster is an instance of `ForecasterAutoregCustom` or 
        `ForecasterAutoregMultiSeriesCustom`.
    refit : bool, int, default `False`
        Whether to re-fit the forecaster in each iteration. If `refit` is an 
        integer, the Forecaster will be trained every that number of iterations.
    return_best : bool, default `True`
        Refit the `forecaster` using the best found parameters on the whole data.
    n_jobs : int, 'auto', default `'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_backtesting.
        **New in version 0.9.0**
    verbose : bool, default `True`
        Print number of folds used for cv or backtesting.
    show_progress : bool, default `True`
        Whether to show a progress bar.
    suppress_warnings: bool, default `False`
        If `True`, skforecast warnings will be suppressed during the hyperparameter 
        search. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    output_file : str, default `None`
        Specifies the filename or full path where the results should be saved. 
        The results will be saved in a tab-separated values (TSV) format. If 
        `None`, the results will not be saved to a file.
        **New in version 0.12.0**

    Returns
    -------
    results : pandas DataFrame
        Results for each combination of parameters.

        - column levels: levels configuration for each iteration.
        - column lags: lags configuration for each iteration.
        - column lags_label: descriptive label or alias for the lags.
        - column params: parameters configuration for each iteration.
        - column metric: metric value estimated for each iteration. The resulting 
        metric will be the average of the optimization of all levels.
        - additional n columns with param = value.

    """

    results = grid_search_forecaster_multiseries(
        forecaster            = forecaster,
        series                = series,
        param_grid            = param_grid,
        steps                 = steps,
        metric                = metric,
        initial_train_size    = initial_train_size,
        fixed_train_size      = fixed_train_size,
        gap                   = gap,
        allow_incomplete_fold = allow_incomplete_fold,
        levels                = levels,
        exog                  = exog,
        lags_grid             = lags_grid,
        refit                 = refit,
        return_best           = return_best,
        n_jobs                = n_jobs,
        verbose               = verbose,
        show_progress         = show_progress,
        suppress_warnings     = suppress_warnings,
        output_file           = output_file
    )

    return results

`random_search_forecaster_multivariate(forecaster, series, param_distributions, steps, metric, initial_train_size, fixed_train_size=True, gap=0, allow_incomplete_fold=True, levels=None, exog=None, lags_grid=None, refit=False, n_iter=10, random_state=123, return_best=True, n_jobs='auto', verbose=True, show_progress=True, suppress_warnings=False, output_file=None)` ¶

This function is an alias of random_search_forecaster_multiseries.

Random search over specified parameter values or distributions for a Forecaster object. Validation is done using multi-series backtesting.

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate)`	Forecaster model.	required
`series`	`pandas DataFrame, dict`	Training time series.	required
`param_distributions`	`dict`	Dictionary with parameters names (`str`) as keys and distributions or lists of parameters to try.	required
`steps`	`int`	Number of steps to predict.	required
`metric`	`(str, Callable, list)`	Metric used to quantify the goodness of fit of the model. If `string`: {'mean_squared_error', 'mean_absolute_error', 'mean_absolute_percentage_error', 'mean_squared_log_error'} If `Callable`: Function with arguments y_true, y_pred that returns a float. If `list`: List containing multiple strings and/or Callables.	required
`initial_train_size`	`int`	Number of samples in the initial train split.	required
`fixed_train_size`	`bool`	If True, train size doesn't increase but moves by `steps` in each iteration.	`True`
`gap`	`int`	Number of samples to be excluded after the end of each training set and before the test set.	`0`
`allow_incomplete_fold`	`bool`	Last fold is allowed to have a smaller number of samples than the `test_size`. If `False`, the last fold is excluded.	`True`
`levels`	`(str, list)`	level (`str`) or levels (`list`) at which the forecaster is optimized. If `None`, all levels are taken into account. The resulting metric will be the average of the optimization of all levels.	`None`
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`lags_grid`	`(list, dict)`	Lists of lags to try, containing int, lists, numpy ndarray, or range objects. If `dict`, the keys are used as labels in the `results` DataFrame, and the values are used as the lists of lags to try. Ignored if the forecaster is an instance of `ForecasterAutoregCustom` or `ForecasterAutoregMultiSeriesCustom`.	`None`
`refit`	`(bool, int)`	Whether to re-fit the forecaster in each iteration. If `refit` is an integer, the Forecaster will be trained every that number of iterations.	`False`
`n_iter`	`int`	Number of parameter settings that are sampled per lags configuration. n_iter trades off runtime vs quality of the solution.	`10`
`random_state`	`int`	Sets a seed to the random sampling for reproducible output.	`123`
`return_best`	`bool`	Refit the `forecaster` using the best found parameters on the whole data.	`True`
`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_backtesting. New in version 0.9.0	`'auto'`
`verbose`	`bool`	Print number of folds used for cv or backtesting.	`True`
`show_progress`	`bool`	Whether to show a progress bar.	`True`
`suppress_warnings`	`bool`	If `True`, skforecast warnings will be suppressed during the hyperparameter search. See skforecast.exceptions.warn_skforecast_categories for more information.	`False`
`output_file`	`str`	Specifies the filename or full path where the results should be saved. The results will be saved in a tab-separated values (TSV) format. If `None`, the results will not be saved to a file. New in version 0.12.0	`None`

Returns:

Name	Type	Description
`results`	`pandas DataFrame`	Results for each combination of parameters. column levels: levels configuration for each iteration. column lags: lags configuration for each iteration. column lags_label: descriptive label or alias for the lags. column params: parameters configuration for each iteration. column metric: metric value estimated for each iteration. The resulting metric will be the average of the optimization of all levels. additional n columns with param = value.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def random_search_forecaster_multivariate(
    forecaster: object,
    series: Union[pd.DataFrame, dict],
    param_distributions: dict,
    steps: int,
    metric: Union[str, Callable, list],
    initial_train_size: int,
    fixed_train_size: bool=True,
    gap: int=0,
    allow_incomplete_fold: bool=True,
    levels: Optional[Union[str, list]]=None,
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    lags_grid: Optional[Union[list, dict]]=None,
    refit: Union[bool, int]=False,
    n_iter: int=10,
    random_state: int=123,
    return_best: bool=True,
    n_jobs: Union[int, str]='auto',
    verbose: bool=True,
    show_progress: bool=True,
    suppress_warnings: bool=False,
    output_file: Optional[str]=None
) -> pd.DataFrame:
    """
    This function is an alias of random_search_forecaster_multiseries.

    Random search over specified parameter values or distributions for a Forecaster 
    object. Validation is done using multi-series backtesting.

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate
        Forecaster model.
    series : pandas DataFrame, dict
        Training time series.
    param_distributions : dict
        Dictionary with parameters names (`str`) as keys and distributions or 
        lists of parameters to try.
    steps : int
        Number of steps to predict.
    metric : str, Callable, list
        Metric used to quantify the goodness of fit of the model.

        - If `string`: {'mean_squared_error', 'mean_absolute_error',
        'mean_absolute_percentage_error', 'mean_squared_log_error'}
        - If `Callable`: Function with arguments y_true, y_pred that returns 
        a float.
        - If `list`: List containing multiple strings and/or Callables.
    initial_train_size : int 
        Number of samples in the initial train split.
    fixed_train_size : bool, default `True`
        If True, train size doesn't increase but moves by `steps` in each iteration.
    gap : int, default `0`
        Number of samples to be excluded after the end of each training set and 
        before the test set.
    allow_incomplete_fold : bool, default `True`
        Last fold is allowed to have a smaller number of samples than the 
        `test_size`. If `False`, the last fold is excluded.
    levels : str, list, default `None`
        level (`str`) or levels (`list`) at which the forecaster is optimized. 
        If `None`, all levels are taken into account. The resulting metric will be
        the average of the optimization of all levels.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    lags_grid : list, dict, default `None`
        Lists of lags to try, containing int, lists, numpy ndarray, or range 
        objects. If `dict`, the keys are used as labels in the `results` 
        DataFrame, and the values are used as the lists of lags to try. Ignored 
        if the forecaster is an instance of `ForecasterAutoregCustom` or 
        `ForecasterAutoregMultiSeriesCustom`.
    refit : bool, int, default `False`
        Whether to re-fit the forecaster in each iteration. If `refit` is an 
        integer, the Forecaster will be trained every that number of iterations.
    n_iter : int, default `10`
        Number of parameter settings that are sampled per lags configuration. 
        n_iter trades off runtime vs quality of the solution.
    random_state : int, default `123`
        Sets a seed to the random sampling for reproducible output.
    return_best : bool, default `True`
        Refit the `forecaster` using the best found parameters on the whole data.
    n_jobs : int, 'auto', default `'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_backtesting.
        **New in version 0.9.0**
    verbose : bool, default `True`
        Print number of folds used for cv or backtesting.
    show_progress : bool, default `True`
        Whether to show a progress bar.
    suppress_warnings: bool, default `False`
        If `True`, skforecast warnings will be suppressed during the hyperparameter 
        search. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    output_file : str, default `None`
        Specifies the filename or full path where the results should be saved. 
        The results will be saved in a tab-separated values (TSV) format. If 
        `None`, the results will not be saved to a file.
        **New in version 0.12.0**

    Returns
    -------
    results : pandas DataFrame
        Results for each combination of parameters.

        - column levels: levels configuration for each iteration.
        - column lags: lags configuration for each iteration.
        - column lags_label: descriptive label or alias for the lags.
        - column params: parameters configuration for each iteration.
        - column metric: metric value estimated for each iteration. The resulting 
        metric will be the average of the optimization of all levels.
        - additional n columns with param = value.

    """

    results = random_search_forecaster_multiseries(
        forecaster            = forecaster,
        series                = series,
        param_distributions   = param_distributions,
        steps                 = steps,
        metric                = metric,
        initial_train_size    = initial_train_size,
        fixed_train_size      = fixed_train_size,
        gap                   = gap,
        allow_incomplete_fold = allow_incomplete_fold,
        levels                = levels,
        exog                  = exog,
        lags_grid             = lags_grid,
        refit                 = refit,
        n_iter                = n_iter,
        random_state          = random_state,
        return_best           = return_best,
        n_jobs                = n_jobs,
        verbose               = verbose,
        show_progress         = show_progress,
        suppress_warnings     = suppress_warnings,
        output_file           = output_file
    ) 

    return results

`bayesian_search_forecaster_multivariate(forecaster, series, search_space, steps, metric, initial_train_size, fixed_train_size=True, gap=0, allow_incomplete_fold=True, levels=None, exog=None, lags_grid='deprecated', refit=False, n_trials=10, random_state=123, return_best=True, n_jobs='auto', verbose=True, show_progress=True, suppress_warnings=False, output_file=None, engine='optuna', kwargs_create_study={}, kwargs_study_optimize={})` ¶

This function is an alias of bayesian_search_forecaster_multiseries.

Bayesian optimization for a Forecaster object using multi-series backtesting and optuna library. New in version 0.12.0

Parameters:

Name	Type	Description	Default
`forecaster`	`(ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate)`	Forecaster model.	required
`series`	`pandas DataFrame, dict`	Training time series.	required
`search_space`	`Callable`	Function with argument `trial` which returns a dictionary with parameters names (`str`) as keys and Trial object from optuna (trial.suggest_float, trial.suggest_int, trial.suggest_categorical) as values.	required
`steps`	`int`	Number of steps to predict.	required
`metric`	`(str, Callable, list)`	Metric used to quantify the goodness of fit of the model. If `string`: {'mean_squared_error', 'mean_absolute_error', 'mean_absolute_percentage_error', 'mean_squared_log_error'} If `Callable`: Function with arguments y_true, y_pred that returns a float. If `list`: List containing multiple strings and/or Callables.	required
`initial_train_size`	`int`	Number of samples in the initial train split.	required
`fixed_train_size`	`bool`	If True, train size doesn't increase but moves by `steps` in each iteration.	`True`
`gap`	`int`	Number of samples to be excluded after the end of each training set and before the test set.	`0`
`allow_incomplete_fold`	`bool`	Last fold is allowed to have a smaller number of samples than the `test_size`. If `False`, the last fold is excluded.	`True`
`levels`	`(str, list)`	level (`str`) or levels (`list`) at which the forecaster is optimized. If `None`, all levels are taken into account. The resulting metric will be the average of the optimization of all levels.	`None`
`exog`	`pandas Series, pandas DataFrame, dict`	Exogenous variables.	`None`
`lags_grid`	`deprecated`	Deprecated since version 0.12.0 and will be removed in 0.13.0. Use `search_space` to define the candidate values for the lags. This allows the lags to be optimized along with the other hyperparameters of the regressor in the bayesian search.	`'deprecated'`
`refit`	`(bool, int)`	Whether to re-fit the forecaster in each iteration. If `refit` is an integer, the Forecaster will be trained every that number of iterations.	`False`
`n_trials`	`int`	Number of parameter settings that are sampled in each lag configuration.	`10`
`random_state`	`int`	Sets a seed to the sampling for reproducible output.	`123`
`return_best`	`bool`	Refit the `forecaster` using the best found parameters on the whole data.	`True`
`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_backtesting. New in version 0.9.0	`'auto'`
`verbose`	`bool`	Print number of folds used for cv or backtesting.	`True`
`show_progress`	`bool`	Whether to show a progress bar.	`True`
`suppress_warnings`	`bool`	If `True`, skforecast warnings will be suppressed during the hyperparameter search. See skforecast.exceptions.warn_skforecast_categories for more information.	`False`
`output_file`	`str`	Specifies the filename or full path where the results should be saved. The results will be saved in a tab-separated values (TSV) format. If `None`, the results will not be saved to a file. New in version 0.12.0	`None`
`engine`	`str`	Bayesian optimization runs through the optuna library.	`'optuna'`
`kwargs_create_study`	`dict`	Keyword arguments (key, value mappings) to pass to optuna.create_study(). If default, the direction is set to 'minimize' and a TPESampler(seed=123) sampler is used during optimization.	`{}`
`kwargs_study_optimize`	`dict`	Other keyword arguments (key, value mappings) to pass to study.optimize().	`{}`

Returns:

Name	Type	Description
`results`	`pandas DataFrame`	Results for each combination of parameters. column levels: levels configuration for each iteration. column lags: lags configuration for each iteration. column params: parameters configuration for each iteration. column metric: metric value estimated for each iteration. The resulting metric will be the average of the optimization of all levels. additional n columns with param = value.
`best_trial`	`optuna object`	The best optimization result returned as a FrozenTrial optuna object.

Source code in skforecast\model_selection_multiseries\model_selection_multiseries.py

def bayesian_search_forecaster_multivariate(
    forecaster: object,
    series: Union[pd.DataFrame, dict],
    search_space: Callable,
    steps: int,
    metric: Union[str, Callable, list],
    initial_train_size: int,
    fixed_train_size: bool=True,
    gap: int=0,
    allow_incomplete_fold: bool=True,
    levels: Optional[Union[str, list]]=None,
    exog: Optional[Union[pd.Series, pd.DataFrame, dict]]=None,
    lags_grid: Any='deprecated',
    refit: Union[bool, int]=False,
    n_trials: int=10,
    random_state: int=123,
    return_best: bool=True,
    n_jobs: Union[int, str]='auto',
    verbose: bool=True,
    show_progress: bool=True,
    suppress_warnings: bool=False,
    output_file: Optional[str]=None,
    engine: str='optuna',
    kwargs_create_study: dict={},
    kwargs_study_optimize: dict={}
) -> Tuple[pd.DataFrame, object]:
    """
    This function is an alias of bayesian_search_forecaster_multiseries.

    Bayesian optimization for a Forecaster object using multi-series backtesting 
    and optuna library.
    **New in version 0.12.0**

    Parameters
    ----------
    forecaster : ForecasterAutoregMultiSeries, ForecasterAutoregMultiSeriesCustom, ForecasterAutoregMultiVariate
        Forecaster model.
    series : pandas DataFrame, dict
        Training time series.
    search_space : Callable
        Function with argument `trial` which returns a dictionary with parameters names 
        (`str`) as keys and Trial object from optuna (trial.suggest_float, 
        trial.suggest_int, trial.suggest_categorical) as values.
    steps : int
        Number of steps to predict.
    metric : str, Callable, list
        Metric used to quantify the goodness of fit of the model.

        - If `string`: {'mean_squared_error', 'mean_absolute_error',
        'mean_absolute_percentage_error', 'mean_squared_log_error'}
        - If `Callable`: Function with arguments y_true, y_pred that returns 
        a float.
        - If `list`: List containing multiple strings and/or Callables.
    initial_train_size : int 
        Number of samples in the initial train split.
    fixed_train_size : bool, default `True`
        If True, train size doesn't increase but moves by `steps` in each iteration.
    gap : int, default `0`
        Number of samples to be excluded after the end of each training set and 
        before the test set.
    allow_incomplete_fold : bool, default `True`
        Last fold is allowed to have a smaller number of samples than the 
        `test_size`. If `False`, the last fold is excluded.
    levels : str, list, default `None`
        level (`str`) or levels (`list`) at which the forecaster is optimized. 
        If `None`, all levels are taken into account. The resulting metric will be
        the average of the optimization of all levels.
    exog : pandas Series, pandas DataFrame, dict, default `None`
        Exogenous variables.
    lags_grid : deprecated
        **Deprecated since version 0.12.0 and will be removed in 0.13.0.** Use
        `search_space` to define the candidate values for the lags. This allows 
        the lags to be optimized along with the other hyperparameters of the 
        regressor in the bayesian search.
    refit : bool, int, default `False`
        Whether to re-fit the forecaster in each iteration. If `refit` is an 
        integer, the Forecaster will be trained every that number of iterations.
    n_trials : int, default `10`
        Number of parameter settings that are sampled in each lag configuration.
    random_state : int, default `123`
        Sets a seed to the sampling for reproducible output.
    return_best : bool, default `True`
        Refit the `forecaster` using the best found parameters on the whole data.
    n_jobs : int, 'auto', default `'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_backtesting.
        **New in version 0.9.0**
    verbose : bool, default `True`
        Print number of folds used for cv or backtesting.
    show_progress : bool, default `True`
        Whether to show a progress bar.
    suppress_warnings: bool, default `False`
        If `True`, skforecast warnings will be suppressed during the hyperparameter
        search. See skforecast.exceptions.warn_skforecast_categories for more
        information.
    output_file : str, default `None`
        Specifies the filename or full path where the results should be saved. 
        The results will be saved in a tab-separated values (TSV) format. If 
        `None`, the results will not be saved to a file.
        **New in version 0.12.0**
    engine : str, default `'optuna'`
        Bayesian optimization runs through the optuna library.
    kwargs_create_study : dict, default `{}`
        Keyword arguments (key, value mappings) to pass to optuna.create_study().
        If default, the direction is set to 'minimize' and a TPESampler(seed=123) 
        sampler is used during optimization.
    kwargs_study_optimize : dict, default `{}`
        Other keyword arguments (key, value mappings) to pass to study.optimize().

    Returns
    -------
    results : pandas DataFrame
        Results for each combination of parameters.

        - column levels: levels configuration for each iteration.
        - column lags: lags configuration for each iteration.
        - column params: parameters configuration for each iteration.
        - column metric: metric value estimated for each iteration. The resulting 
        metric will be the average of the optimization of all levels.
        - additional n columns with param = value.
    best_trial : optuna object
        The best optimization result returned as a FrozenTrial optuna object.

    """

    results, best_trial = bayesian_search_forecaster_multiseries(
                              forecaster            = forecaster,
                              series                = series,
                              exog                  = exog,
                              levels                = levels, 
                              lags_grid             = lags_grid,
                              search_space          = search_space,
                              steps                 = steps,
                              metric                = metric,
                              refit                 = refit,
                              initial_train_size    = initial_train_size,
                              fixed_train_size      = fixed_train_size,
                              gap                   = gap,
                              allow_incomplete_fold = allow_incomplete_fold,
                              n_trials              = n_trials,
                              random_state          = random_state,
                              return_best           = return_best,
                              n_jobs                = n_jobs,
                              verbose               = verbose,
                              show_progress         = show_progress,
                              suppress_warnings     = suppress_warnings,
                              output_file           = output_file,
                              engine                = engine,
                              kwargs_create_study   = kwargs_create_study,
                              kwargs_study_optimize = kwargs_study_optimize
                          )

    return results, best_trial

model_selection_multiseries¶

select_features_multiseries(forecaster, selector, series, exog=None, select_only=None, force_inclusion=None, subsample=0.5, random_state=123, verbose=True) ¶

`model_selection_multiseries`¶

`select_features_multiseries(forecaster, selector, series, exog=None, select_only=None, force_inclusion=None, subsample=0.5, random_state=123, verbose=True)` ¶