Python NLTK Brill Tagger does not have SymmetricProximateTokensTemplate, ProximateTokensTemplate, ProximateTagsRule, ProximateWordsRule

问题

When i try importing,

from nltk.tag.brill import SymmetricProximateTokensTemplate, ProximateTokensTemplate from nltk.tag.brill import ProximateTagsRule, ProximateWordsRule

Python Throws Import Error,

ImportError: cannot import name 'SymmetricProximateTokensTemplate'

What's the problem?

but this works

from nltk.tag import brill

回答1:

The Brill part of NLTK has been redesigned in NLTK 3. So all those classes you try to import do not exist any more.
See https://github.com/nltk/nltk/pull/549

I'm looking for an example how to use the Brill Tagger but till now, I didn't find anything.

回答2:

I'm using the templates from nltk.tag.brill.
There are four methods

• nltkdemo18()
• nltkdemo18plus()
• fntbl37()
• brill24()

which return sets of templates. From my evaluation fntbl37() is the best.

Here is some code:

Template._cleartemplates()
templates = fntbl37()
self._tagger = UnigramTagger(tagged_sents)
self._tagger = BrillTaggerTrainer(self._tagger, templates, trace=3)
self._tagger = self._tagger.train(tagged_sents, max_rules=250)

I hope it helps.

来源：https://stackoverflow.com/questions/30323409/python-nltk-brill-tagger-does-not-have-symmetricproximatetokenstemplate-proxima