Jcrfsuite is a Java interface of crfsuite, a fast implementation of Conditional Random Fields, using SWIG and class injection technique (same technique used in snappy-java version 1.1.0).

Example on Twitter Part-of-Speech (POS) tagging

1) Build

To build, you need to install Maven, then run

mvn package

2) Training

To train a POS model from Twitter POS data, run

java -cp target/jcrfsuite-0.1.jar com.github.jcrfsuite.example.Train example/tweet-pos/train-oct27.txt twitter-pos.model

3) Tagging

To test the trained POS model against the test set, run

java -cp target/jcrfsuite-0.1.jar com.github.jcrfsuite.example.Tag twitter-pos.model example/tweet-pos/test-daily547.txt 

The output should be as follows:

Gold	Predict	Probability
........................
N       N       0.99
P       P       1.00
Z       ^       0.59
$       $       0.97
N       N       1.00
P       P       0.98
A       N       0.80
$       $       1.00
N       N       0.99
U       U       1.00

Accuracy = 92.97%

Note that the accuracy might be slightly different than in the above output.