def METHOD_NAME(self, X=None, y=None):
    """No-op.
    This method doesn't do anything. It exists purely for compatibility
    with the scikit-learn transformer API.
    Returns
    -------
    self : FeatureHasher
    """
    # repeat input validation for grid search (which calls set_params)
    self._validate_params(self.n_features, self.input_type)
    return self