qstn_classifier_trainer.py 文件源码

def find_chunk(sent,chunk_rule=None):
    if not chunk_rule: 
        chunk_rule = 'HCHUNK: <W.*><.*>*?{<N.*>+}'
    label=chunk_rule.split(':')[0].strip()
    cp = nltk.RegexpParser(chunk_rule)
    tree = cp.parse(sent)
    for subtree in tree.subtrees():
        if subtree.label() == label:
            subtree = ' '.join([a[0] for a in subtree ])
            print (subtree)
            return subtree
##this is required only once