NLTK 中没有 pos_tag 的 ne_chunk

ne_chunk without pos_tag in NLTK(NLTK 中没有 pos_tag 的 ne_chunk)

问题描述

我正在尝试在 nltk 中使用 ne_chunk 和 pos_tag 对句子进行分块.

I'm trying to chunk a sentence using ne_chunk and pos_tag in nltk.

from nltk import tag
from nltk.tag import pos_tag
from nltk.tree import Tree
from nltk.chunk import ne_chunk

sentence = "Michael and John is reading a booklet in a library of Jakarta"
tagged_sent = pos_tag(sentence.split())

print_chunk = [chunk for chunk in ne_chunk(tagged_sent) if isinstance(chunk, Tree)]

print print_chunk

这是结果:

[Tree('GPE', [('Michael', 'NNP')]), Tree('PERSON', [('John', 'NNP')]), Tree('GPE', [('Jakarta', 'NNP')])]

我的问题是，是否可以不包含 pos_tag(如上面的 NNP)而只包含树 'GPE'、'PERSON'?GPE"是什么意思?

my question, is it possible not to include pos_tag (like NNP above) and only include Tree 'GPE','PERSON'? and what 'GPE' means?

提前致谢

推荐答案

命名实体分块器将为您提供一个包含分块和标签的树.你不能改变它，但你可以去掉标签.从您的 tagged_sent 开始:

The named entity chunker will give you a tree containing both chunks and tags. You can't change that, but you can take the tags out. Starting from your tagged_sent:

chunks = nltk.ne_chunk(tagged_sent)
simple = []
for elt in chunks:
    if isinstance(elt, Tree):
        simple.append(Tree(elt.label(), [ word for word, tag in elt ]))
    else:
        simple.append( elt[0] )

如果您只想要块，请省略上面的 else: 子句.您可以调整代码以任何您想要的方式包装块.我使用 nltk Tree 将更改保持在最低限度.请注意，某些块由多个单词组成(尝试在您的示例中添加New York")，因此块的内容必须是一个列表，而不是单个元素.

If you only want the chunks, omit the else: clause in the above. You can adapt the code to wrap the chunks any way you want. I used an nltk Tree to keep the changes to a minimum. Note that some chunks consist of multiple words (try adding "New York" to your example), so the chunk's contents must be a list, not a single element.

附注.GPE"代表地缘政治实体"(显然是一个词组错误).你可以在nltk书中看到常用标签"的列表，这里.

PS. "GPE" stands for "geo-political entity" (obviously a chunker mistake). You can see a list of the "commonly used tags" in the nltk book, here.

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