def METHOD_NAME(self, y, X=None, **kwargs):  # TODO: kwargs go away
    """Fit the transformer
    Must be called before ``transform``.
    Parameters
    ----------
    y : array-like or None, shape=(n_samples,)
        The endogenous (time-series) array.
    X : array-like or None, shape=(n_samples, n_features), optional
        The exogenous array of additional covariates. Not used for
        endogenous transformers. Default is None, and non-None values will
        serve as pass-through arrays.
    """
    return super().METHOD_NAME(y, X, **kwargs)