check_splitter_panel_data_support¶

def check_splitter_panel_data_support(
    splitter,
    y_panel: pl.DataFrame,
    X_panel: pl.DataFrame | None = None,
) -> None:
    """Check splitter handles panel data if supports_panel_data=True.

    Parameters
    ----------
    splitter : BaseSplitter
        Splitter instance
    y_panel : pl.DataFrame
        Panel data with prefixed columns following group__column naming
        (e.g., "store_1__sales")
    X_panel : pl.DataFrame, optional
        Panel exogenous features

    Raises
    ------
    AssertionError
        If splitter declares support but fails on panel data

    """
    tags = splitter.__sklearn_tags__()
    if not tags.splitter_tags.supports_panel_data:
        # Skip check if panel data not supported
        return

    # Should not raise on panel data
    try:
        splits = list(splitter.split(y_panel, X_panel))
        assert len(splits) > 0, "Panel data split produced no splits"
    except Exception as e:
        raise AssertionError(f"Splitter declares supports_panel_data=True but failed on panel data: {e}") from e