激发NLTK词性标记器来报告复数专有名词 [英] Provoke the NLTK part-of-speech tagger to report a plural proper noun

问题描述

让我们尝试在nltk包中试用Python的语音部分标记器.

Let's try out Python's renouned part-of-speech tagger in the nltk package.

import nltk
# You might also need to run nltk.download('maxent_treebank_pos_tagger') 
#  even after installing nltk

string = 'Buddy Billy went to the moon and came Back with several Vikings.'
nltk.pos_tag(nltk.word_tokenize(string))

这给了我

[('Buddy'，'NNP')，('Billy'，'NNP')，('went'，'VBD')，('to'，'TO')， ('the'，'DT')，('moon'，'NN')，('and'，'CC')，('came'，'VBD')， ('Back'，'NNP')，('with'，'IN')，('几个'，'JJ')，('Vikings'， 'NNS')，('.'，'.')]

[('Buddy', 'NNP'), ('Billy', 'NNP'), ('went', 'VBD'), ('to', 'TO'), ('the', 'DT'), ('moon', 'NN'), ('and', 'CC'), ('came', 'VBD'), ('Back', 'NNP'), ('with', 'IN'), ('several', 'JJ'), ('Vikings', 'NNS'), ('.', '.')]

您可以在此处解释代码.我对"Back"被归类为专有名词(NNP)感到有些失望，尽管这种混淆是可以理解的.我更沮丧的是，维京人"被称为简单复数名词(NNS)而不是复数专有名词(NNPS).任何人都可以拿出一个简短输入的示例来产生至少一个NNPS标签吗?

You can interpret the codes here. I'm slightly disappointed that 'Back' got categorized as a proper noun (NNP), although the confusion is understandable. I'm more upset that 'Vikings' got called a simple plural noun (NNS) instead of a plural proper noun (NNPS). Can anyone come up with a single example of a brief input that leads to at least one NNPS tag?

推荐答案

NLTK棕色语料库中的标记似乎有些问题，这些标记将NNPS标记为NPS(可能是NLTK标记集是更新/过时的标记与 https://www.ling.upenn.edu/courses不同/Fall_2003/ling001/penn_treebank_pos.html )

There seems to be some problems with the tags in NLTK brown corpus that tags NNPS as NPS (Possibly the NLTK tagset is an updated/outdated tags that is different from https://www.ling.upenn.edu/courses/Fall_2003/ling001/penn_treebank_pos.html)

这是plural proper nouns的示例:

>>> from nltk.corpus import brown
>>> for sent in brown.tagged_sents():
...     if any(pos for word, pos in sent if pos == 'NPS'):
...             print sent
...             break
... 
[(u'Georgia', u'NP'), (u'Republicans', u'NPS'), (u'are', u'BER'), (u'getting', u'VBG'), (u'strong', u'JJ'), (u'encouragement', u'NN'), (u'to', u'TO'), (u'enter', u'VB'), (u'a', u'AT'), (u'candidate', u'NN'), (u'in', u'IN'), (u'the', u'AT'), (u'1962', u'CD'), (u"governor's", u'NN$'), (u'race', u'NN'), (u',', u','), (u'a', u'AT'), (u'top', u'JJS'), (u'official', u'NN'), (u'said', u'VBD'), (u'Wednesday', u'NR'), (u'.', u'.')]

但是，如果您使用nltk.pos_tag进行标记，则会得到NNPS:

But if you tag with nltk.pos_tag, you'll get NNPS:

>>> for sent in brown.tagged_sents():
...     if any(pos for word, pos in sent if pos == 'NPS'):
...             print " ".join([word for word, pos in sent])
...             break
... 
Georgia Republicans are getting strong encouragement to enter a candidate in the 1962 governor's race , a top official said Wednesday .
>>> from nltk import pos_tag
>>> pos_tag("Georgia Republicans are getting strong encouragement to enter a candidate in the 1962 governor's race , a top official said Wednesday .".split())
[('Georgia', 'NNP'), ('Republicans', 'NNPS'), ('are', 'VBP'), ('getting', 'VBG'), ('strong', 'JJ'), ('encouragement', 'NN'), ('to', 'TO'), ('enter', 'VB'), ('a', 'DT'), ('candidate', 'NN'), ('in', 'IN'), ('the', 'DT'), ('1962', 'CD'), ("governor's", 'NNS'), ('race', 'NN'), (',', ','), ('a', 'DT'), ('top', 'JJ'), ('official', 'NN'), ('said', 'VBD'), ('Wednesday', 'NNP'), ('.', '.')]

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