def compact(self, term_doc_matrix):
        '''
        Parameters
        ----------
        term_doc_matrix : TermDocMatrix
            Term document matrix object to compact
        Returns
        -------
        TermDocMatrix


        '''
        rank_df = self.scorer.get_rank_df(term_doc_matrix)
        return self._prune_higher_ranked_terms(term_doc_matrix, rank_df, self.rank)
Parameters
        ----------
        term_doc_matrix : TermDocMatrix
            Term document matrix object to compact
        Returns
        -------
        TermDocMatrix