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Is there a popular implementation of Conditional Random Fields in Python?

I can't seem to find any that is widely used and popular!

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2 Answers

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CRF++ is a popular choice in general, and has Python bindings. CRFSuite also has bindings documented here, but doesn't seem to have seen as much widespread use as CRF++. As of this writing, higher level machine learning frameworks such as scikit-learn lack CRF support (see this pull request).

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CRF++ has more incoming links because it is an older library.
CRFSuite is superior in my opinion.

  • CRFSuite's author's claim that it is 20x faster than CRF++ at training a model.
  • Less rigid requirements for the input data.

If you are looking for Python bindings CRFSuite is also better because you can train a model in Python, while in CRF++ you can only test existing models in Python. (That was the deal breaker for me.) CRFSuite also comes with a bunch of example code in Python, such as NER, Chunking, and POS tagging.

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