python-crfsuite

python-crfsuite is a python binding to CRFsuite.

Installation

pip install python-crfsuite

Usage

• API Reference
• Example: building a Named Entity Recognition system with python-crfsuite.

python-crfsuite is licensed under MIT license. CRFsuite C/C++ library is licensed under BSD license.

Development happens at github: https://github.com/tpeng/python-crfsuite

Indices and tables

• Index
• Module Index
• Search Page

Changes

0.8.4 (2015-11-25)

• the wrapper is rebuilt with Cython 0.23.4;
• declared Python 3.5 compatibility;
• fixed an issue with feature names ending with white spaces.

0.8.3 (2015-04-24)

• fix build on Windows. (thanks @fgregg)

0.8.2 (2015-02-04)

• memory leak is fixed by updating the bundled CRFsuite C++ library;
• the wrapper is rebuilt with Cython 0.21.2.

0.8.1 (2014-10-10)

• fix packaging issues with 0.8 release.

0.8 (2014-10-10)

• ItemSequence wrapper is added;
• tox tests are fixed.

0.7 (2014-08-11)

• More data formats for xseq: {"prefix": {feature_dict}} and {"key": set(["key1",...])} feature dicts are now accepted by pycrfsuite.Trainer and pycrfsuite.Tagger;
• feature separator changed from “=” to ”:” (it looks better in case of multi-level features);
• small doc and README fixes.

0.6.1 (2014-06-06)

• Switch to setuptools;
• wheels are uploaded to pypi for faster installation.

0.6 (2014-05-29)

• More data formats for xseq: {"key": "value"} and {"key": bool_value} feature dicts are now accepted by pycrfsuite.Trainer and pycrfsuite.Tagger.

0.5 (2014-05-27)

• Exceptions in logging message handlers are now propogated and raised. This allows, for example, to stop training earlier by pressing Ctrl-C.
• It is now possible to customize pycrfsuite.Trainer logging more easily by overriding the following methods: pycrfsuite.Trainer.on_start(), pycrfsuite.Trainer.on_featgen_progress(), pycrfsuite.Trainer.on_featgen_end(), pycrfsuite.Trainer.on_prepared(), pycrfsuite.Trainer.on_prepare_error(), pycrfsuite.Trainer.on_iteration(), pycrfsuite.Trainer.on_optimization_end() pycrfsuite.Trainer.on_end(). The feature is implemented by parsing CRFsuite log. There is pycrfsuite.BaseTrainer that is not doing this.

0.4.1 (2014-05-18)

• pycrfsuite.Tagger.info() is fixed.

0.4 (2014-05-16)

• (backwards-incompatible) training parameters are now passed using params argument of pycrfsuite.Trainer constructor instead of **kwargs;
• (backwards-incompatible) logging support is dropped;
• verbose argument for pycrfsuite.Trainer constructor;
• pycrfsuite.Trainer.get_params() and pycrfsuite.Trainer.set_params() for getting/setting multiple training parameters at once;
• string handling in Python 3.x is fixed by rebuilding the wrapper with Cython 0.21dev;
• algorithm names are normalized to support names used by crfsuite console utility and documented in crfsuite manual;
• type conversion for training parameters is fixed: feature.minfreq now works, and boolean arguments become boolean.

0.3 (2014-05-14)

python-crfsuite now detects the featue format (dict vs list of strings) automatically - it turns out the performance overhead is negligible.

• Trainer.append_stringslists and Trainer.append_dicts methods are replaced with a single pycrfsuite.Trainer.append() method;
• Tagger.set_stringlists and Tagger.set_dicts methods are removed in favor of pycrfsuite.Tagger.set() method;
• feature_format arguments in pycrfsuite.Tagger methods and constructor are dropped.

0.2 (2014-05-14)

• pycrfsuite.Tagger.dump() and pycrfsuite.Tagger.info() methods for model debugging;
• a memory leak in Trainer is fixed (trainer instances were never garbage collected);
• documentation and testing improvements.

0.1 (2014-04-30)

Many changes; python-crfsuite is almost rewritten.

0.0.1 (2014-04-24)

Initial release.