dictionary.py 文件源码

def compactify(self):
        """
        Assign new word ids to all words.

        This is done to make the ids more compact, e.g. after some tokens have
        been removed via :func:`filter_tokens` and there are gaps in the id series.
        Calling this method will remove the gaps.
        """
        logger.debug("rebuilding dictionary, shrinking gaps")

        # build mapping from old id -> new id
        idmap = dict(izip(itervalues(self.token2id), xrange(len(self.token2id))))

        # reassign mappings to new ids
        self.token2id = dict((token, idmap[tokenid]) for token, tokenid in iteritems(self.token2id))
        self.id2token = {}
        self.dfs = dict((idmap[tokenid], freq) for tokenid, freq in iteritems(self.dfs))