swda.py 文件源码

def __wn_lemmatize(self, lemma):
        """
        Lemmatize lemma using wordnet.stemWordNetLemmatizer(). Always
        returns a (string, pos) pair.  Lemmatizes even when the tag
        isn't helpful, by ignoring it for stemming.
        """
        string, tag = lemma
        wnl = WordNetLemmatizer()
        if tag in ('a', 'n', 'r', 'v'):
            string = wnl.lemmatize(string, tag)
        else:
            string = wnl.lemmatize(string)
        return (string, tag)