(self)
Returns list of human-readable description/names for each feature
        this featurizer produces.
Returns list of human-readable description/names for each feature
        this featurizer produces.
Returns list of human - readable description / names for each feature this featurizer produces .
def feature_names(self):
        """
        Returns list of human-readable description/names for each feature
        this featurizer produces.
        """
        raise NotImplementedError
def feature_names ( self ) : raise NotImplementedError