4

In NLTK like HMM tagger, there seems to be CRF tagger also. But I am not finding any tutorial or help. How should I do it?

Franck Dernoncourt
  • 77,520
  • 72
  • 342
  • 501
Coeus2016
  • 355
  • 4
  • 14

2 Answers2

6

Really really late answer on this one, but just in case you wanted to have an example, you can find one here. Also note that this CRF interface is not an interface to Mallet, but it is an interface to CRFsuite

N00bsie
  • 469
  • 3
  • 19
2

Based on this, I gather that the CRF tagger in NLTK is just an interface for Mallet's CRF implementation. So, I think this tutorial on using Mallet's CRF might be helpful as it would give insight into the steps required to get CRF to work in Mallet and the NLTK module should proceed in the same way. I couldn't find any tutorial on NLTK-CRF, either

rajatkhanduja
  • 974
  • 1
  • 9
  • 28
  • 1
    Are you sure it is based on Mallet? I might be a bit late to this, but I think the CRF tagger is actually an interface to [CRFsuite](https://github.com/chokkan/crfsuite) – N00bsie May 09 '15 at 20:25
  • @N00bsie used to be Mallet https://github.com/nltk/nltk/issues/104. "In #855 we are discussing the idea of using CRFSuite instead of Mallet. There seems to be no reason to provide a Mallet interface. Unless there are any objections, I propose that we provide a CRF tagger using CRFSuite." ; https://github.com/nltk/nltk/pull/855 : "We've agreed to use CRFSuite instead. The main advantage of Mallet is configurability, and this is not exposed via the NLTK wrapper. We prefer the faster speed of CRFSuite." – Franck Dernoncourt Sep 11 '15 at 19:11
  • 1
    http://www.nltk.org/api/nltk.tag.html#module-nltk.tag.crf Here it clearly says that CRF tagger is an interface to CRFSuite. – AKA Aug 06 '16 at 05:53