def clause_indices(self):
        """The list of clause indices in ``words`` layer.
        The indices are unique only in the boundary of a single sentence.
        """
        if not self.is_tagged(CLAUSE_ANNOTATION):
            self.tag_clause_annotations()
        return [word.get(CLAUSE_IDX, None) for word in self[WORDS]]
def clause_indices ( self ) : if not self . is_tagged ( CLAUSE_ANNOTATION ) : self . tag_clause_annotations ( ) return [ word . get ( CLAUSE_IDX , None ) for word in self [ WORDS ] ]
The list of clause indices in ``words`` layer.
        The indices are unique only in the boundary of a single sentence.