Conditional Random Field (CRF)

Overview

• Wikipedia: Conditional random field
• Paper: An Introduction to Conditional Random Fields
• CRF as Recurrent Neural Networks

Implementations

• C++:
  • taku910/crfpp (CRF++)
  • chokkan/crfsuite (Fast)
• Java:
  • isher-stern/CRF
  • vinhkhuc/jcrfsuite (CRFsuite wrapper)
• TensorFlow: contrib.crf

Tools & Corpora

• YamCha - Yet Another Multipurpose CHunk Annotator.
• CoNLL-2000 Chunking Task

CRF++ Usage

# Installation
git clone https://github.com/taku910/crfpp.git
cd crfpp
./configure --prefix $PWD/dist
# Fix windows include on Linux/Mac if needed
# sed -i '/#include "winmain.h"/d' crf_test.cpp crf_learn.cpp
make install

# Training
crf_learn pattern.txt train.data model.bin -t