wordnet.py 文件源码

def closure(self, rel, depth=-1):
        """Return the transitive closure of source under the rel
        relationship, breadth-first

            >>> from nltk.corpus import wordnet as wn
            >>> dog = wn.synset('dog.n.01')
            >>> hyp = lambda s:s.hypernyms()
            >>> list(dog.closure(hyp))
            [Synset('canine.n.02'), Synset('domestic_animal.n.01'),
            Synset('carnivore.n.01'), Synset('animal.n.01'),
            Synset('placental.n.01'), Synset('organism.n.01'),
            Synset('mammal.n.01'), Synset('living_thing.n.01'),
            Synset('vertebrate.n.01'), Synset('whole.n.02'),
            Synset('chordate.n.01'), Synset('object.n.01'),
            Synset('physical_entity.n.01'), Synset('entity.n.01')]

        """
        from nltk.util import breadth_first
        synset_offsets = []
        for synset in breadth_first(self, rel, depth):
            if synset._offset != self._offset:
                if synset._offset not in synset_offsets:
                    synset_offsets.append(synset._offset)
                    yield synset