relextract.py 文件源码

def ieer_headlines():

    from nltk.corpus import ieer
    from nltk.tree import Tree

    print("IEER: First 20 Headlines")
    print("=" * 45)  

    trees = [(doc.docno, doc.headline) for file in ieer.fileids() for doc in ieer.parsed_docs(file)]
    for tree in trees[:20]:
        print()
        print("%s:\n%s" % tree)



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## Dutch CONLL2002: take_on_role(PER, ORG
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