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/scrapinghub/python-crfsuite

Indices and tables¶

Changes¶

0.9.6 (2018-08-01)¶

Python 3.7 support (thanks @fgregg, @danmacnaughtan and @fuhrysteve).
Python 3.3 support is dropped.
new Tagger.open_inmemory method which allows to load tagger data without having a file on-disk (thanks @lucywang000).
license information is added to setup.py (thanks @nils-werner).

0.9.5 (2017-09-05)¶

Python 3.6 wheels for Windows (thanks @fgregg).

0.9.4 (2017-09-04)¶

Packaging fix (thanks @fgregg).

0.9.3 (2017-09-03)¶

Fixed compatibility with Python 3.5+ on Windows (thanks @fgregg);
CRFSuite C++ library is updated to latest version, this fixes several memory leaks and improves performance (thanks @fgregg);
extension is rebuilt with Cython 0.26.1.

0.9.2 (2017-05-04)¶

binary wheels for OS X and Linux (thanks @jeancochrane).

0.9.1 (2016-12-19)¶

This is a release without changes in functionality.

Repository is moved to https://github.com/scrapinghub/python-crfsuite;
We’re now providing Windows wheels for Python 2.7, 3.3. and 3.4.

0.9 (2016-12-08)¶

Python 2.6 support is dropped;
CRFSuite C++ library is updated to a more recent commit;
improved Windows support (thanks @fgregg);
fixed building with gcc < 5.0.0 (thanks @kantan2015);
extension is rebuilt with Cython 0.25.1; this improves PyPy compatibility (but we’re not quite there yet).
docs: trainer.logparser example is added to the notebook (thanks @samgalen).

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.