Spacy to extract specific noun phrase

问题

Can I use spacy in python to find NP with specific neighbors? I want Noun phrases from my text that has verb before and after it.

回答1:

1. You can merge the noun phrases ( so that they do not get tokenized seperately).

2. Analyse the dependency parse tree, and see the POS of neighbouring tokens.

   >>> import spacy
   >>> nlp = spacy.load('en')
   >>> sent = u'run python program run, to make this work'
   >>> parsed = nlp(sent)
   >>> list(parsed.noun_chunks)
   [python program]
   >>> for noun_phrase in list(parsed.noun_chunks):
   ...     noun_phrase.merge(noun_phrase.root.tag_, noun_phrase.root.lemma_, noun_phrase.root.ent_type_)
   ... 
   python program
   >>> [(token.text,token.pos_) for token in parsed]
   [(u'run', u'VERB'), (u'python program', u'NOUN'), (u'run', u'VERB'), (u',', u'PUNCT'), (u'to', u'PART'), (u'make', u'VERB'), (u'this', u'DET'), (u'work', u'NOUN')]
   

3. By analysing the POS of adjacent tokens, you can get your desired noun phrases.

4. A better approach would be to analyse the dependency parse tree, and see the lefts and rights of the noun phrase, so that even if there is a punctuation or other POS tag between the noun phrase and verb, you can increase your search coverage

回答2:

From https://spacy.io/usage/linguistic-features#dependency-parse

You can use Noun chunks. Noun chunks are "base noun phrases" – flat phrases that have a noun as their head. You can think of noun chunks as a noun plus the words describing the noun – for example, "the lavish green grass" or "the world’s largest tech fund". To get the noun chunks in a document, simply iterate over Doc.noun_chunks.

In:
        import spacy
    ​    nlp = spacy.load('en_core_web_sm')
        doc = nlp(u"Autonomous cars shift insurance liability toward manufacturers")
        for chunk in doc.noun_chunks:
            print(chunk.text)

Out:

        Autonomous cars
        insurance liability
        manufacturers

来源：https://stackoverflow.com/questions/44661200/spacy-to-extract-specific-noun-phrase