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CRF++

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">  <html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <link rev="made" href="mailto:taku@chasen.org"> <title>CRF++: Yet Another CRF toolkit</title> <link type="text/css" rel="stylesheet" href="./CRF++ Yet Another CRF toolkit_files/default.css"> <style type="text/css"></style></head> <body> <h1>CRF++: Yet Another CRF toolkit</h1> <h2>Introduction</h2> CRF++ is a simple, customizable, and open source implementation of <a href="http://www.cis.upenn.edu/~pereira/papers/crf.pdf">Conditional Random Fields (CRFs)</a> for segmenting/labeling sequential data. CRF++ is designed for generic purpose and will be applied to a variety of NLP tasks, such as Named Entity Recognition, Information Extraction and Text Chunking. <h2>Table of contents</h2> <ul> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#features">Features</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#news">News</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#download">Download</a> </li> <ul> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#source">Source</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#windows">Binary package for MS-Windows</a></li> </ul> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#install">Installation</a></li> <li> <a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#usage">Usage</a> <ul> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#format">Training and Test file formats</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#templ">Preparing feature templates</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#training">Training (encoding)</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#testing">Testing (decoding)</a></li> </ul> </li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#tips">Case studies</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#tips">Useful Tips</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#todo">To do</a></li> <li><a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#links">Links</a></li> </ul> <h2><a name="features">Features</a></h2> <ul> <li>Can redefine feature sets</li> <li>Written in C++ with STL</li> <li>Fast training based on <a href="http://www-fp.mcs.anl.gov/otc/Guide/SoftwareGuide/Blurbs/lbfgs.html">LBFGS</a>, a quasi-newton algorithm for large scale numerical optimization problem</li> <li>Less memory usage both in training and testing</li> <li>encoding/decoding in practical time</li> <li>Can perform n-best outputs</li> <li>Can perform single-best MIRA training</li> <li>Can output marginal probabilities for all candidates</li> <li>Available as an open source software</li> </ul> <h2><a name="news">News</a></h2> <ul> 2013-02-13: <a href="http://crfpp.googlecode.com/svn/trunk/doc/index.html?source=navbar#download">CRF++ 0.58</a> Released <ul> <li>Added createModelFromArray() method to load model file from fixed buffer. </li><li>Added getTemplate() method to get template string. </li></ul> 2012-03-25 <ul> <li>Fixed build issue around libtool. </li><li>Fixed C++11 compatible issue. </li></ul> 2012-02-24 <ul> <li>Added CRFPP:Tagger::set_model() method. </li><li>Fixed minor bugs </li></ul> 2012-02-15: CRF++ 0.55 <ul> <li>Added new CRFPP:Model class so that multiple threads can share single CRF++ model. </li><li>Added Tagger::set_penalty and Tagger::penalty() method for dual decompositon decoding </li><li>Fixed crash bug on Windows </li><li>Fixed minor bugs </li></ul> 2010-05-16: CRF++ 0.54 Released <ul> <li>fixed the bug in L1 regularization. Reported by Fujii Yasuhisa</li> </ul> 2009-05-06: CRF++ 0.5 Released <ul> <li>fixed build failure on libtool </li></ul> 2009-04-19: CRF++ 0.52 <ul> <li>Code clean up </li><li>replaced obsolete sstream with stringstream </li></ul> 2007-07-12: CRF++ 0.51 <ul> <li>Fixed a compilation error on gcc 4.3 </li></ul> 2007-12-09: CRF++ 0.50 <ul> <li>Bug fix in --convert mode (Could not generate model from text file) </li></ul> 2007-08-18: CRF++ 0.49 <ul> <li>Added setter/getter for nbest, cost_factor and vlevel to API </li></ul> 2007-07-07: CRF++ 0.48 Released <ul> <li>Support L1-CRF. use -a CRF-L1 option to enable L1 regularization. </li></ul> 2007-03-07: CRF++ 0.47 Released <ul> <li>Fixed a bug in MIRA training </li></ul> 2007-02-12: CRF++ 0.46 Released <ul> <li>Changed the licence from LGPL to LGPL/BSD dual license </li><li>Perl/Ruby/Python/Java binding supports (see perl/ruby/python/java directory respectively) </li><li>Code refactoring </li></ul> 2006-11-26: CRF++ 0.45 <ul> <li>Support 1-best MIRA training (use -a MIRA option) </li></ul> 2006-08-18: CRF++ 0.44 <ul> <li>Fixed a bug in feature extraction</li> <li>Allowed redundant spaces in training/test files</li> <li>Determined real column size by looking at template</li> <li>Added sample code of API (sdk/example.cpp) </li><li>Described usage of each API function (crfpp.h) </li></ul> 2006-08-07: CRF++ 0.43 <ul> <li>implemented several API functions to get lattice information</li> <li>added -c option to control cost-factor </li></ul> 2006-03-31: CRF++ 0.42 <ul> <li>Fixed a bug in feature extraction</li> </ul> 2006-03-30: CRF++ 0.41 <ul> <li>Support parallel training</li> </ul> 2006-03-21: CRF++ 0.40 <ul> <li>Fixed a fatal memory leak bug</li> <li>make CRF++ API</li> </ul> 2005-10-29: CRF++ 0.3 <ul> <li>added -t option that enables you to have not only binary model but also text model </li><li>added -C option for converting a text model to a binary model </li></ul> 2005-07-04: CRF++ 0.2 Released <ul> <li>Fixed several bugs</li> </ul> 2005-05-28: CRF++ 0.1 Released <ul> <li>Initial Release</li> </ul> </ul> <h2><a name="download">Download</a></h2> <ul> <li>CRF++ is free software; you can redistribute it and/or modify it under the terms of the <a href="http://www.gnu.org/copyleft/lesser.html">GNU Lesser General Public License</a> or <a href="http://www.opensource.org/licenses/bsd-license.php">new BSD License</a></li>

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