check_coverage_rates_parameter¶

def check_coverage_rates_parameter(forecaster) -> None:
    """Check fit_coverage_rates_ fitted attribute is a non-empty list of floats in [0, 1].

    Inspects the post-fit resolved ``fit_coverage_rates_`` attribute (the
    constructor ``coverage_rates`` param may be ``None`` and is resolved to a
    concrete list during fit), not the constructor argument.

    Parameters
    ----------
    forecaster : BaseIntervalForecaster
        Interval forecaster instance

    Raises
    ------
    AssertionError
        If fit_coverage_rates_ is missing or invalid

    """
    coverage_rates = forecaster.fit_coverage_rates_

    assert isinstance(coverage_rates, list), f"coverage_rates should be list, got {type(coverage_rates)}"

    assert len(coverage_rates) > 0, "coverage_rates should not be empty"

    for rate in coverage_rates:
        assert isinstance(rate, int | float), f"Each coverage rate should be numeric, got {type(rate)} for {rate}"
        assert 0 <= rate <= 1, f"Coverage rates should be in [0, 1], got {rate}"