negation_detection.py 文件源码

def isNegationWord(token):
    import nltk
    if not isinstance(token, nltk.tree.ParentedTree):
        print "something went terribly wrong with", token
        return None
    if (token.label().startswith("V")) or (token.label().startswith("J")):
        word = token[0]
        if not isinstance(word, unicode):
            return False
        word = word.lower()
        word = _stem_(word)
        stemmed_negation_verbs = [_stem_(verb) for verb in NEGATION_VERBS]
        return word in stemmed_negation_verbs
    word = token[0]
    if not isinstance(word, unicode):
        return False
    word = word.lower()
    word = _stem_(word)
    return word in NEGATION_ADVERBS