This is a Java interface for crfsuite, a fast implementation of Conditional Random Fields, using SWIG and class injection technique (the same technique used in snappy-java)
Jcrfsuite can be dropped into any Java web applications and run without problem with JVM's class loader.
Maven dependency
<dependency>
<groupId>com.github.vinhkhuc</groupId>
<artifactId>jcrfsuite</artifactId>
<version>0.6</version>
</dependency>License
Jcrfsuite is released under the Apache License 2.0. The original crfsuite is distributed under the BSD License.
Example on Twitter Part-of-Speech (POS) tagging
1) Training
To train a POS model from Twitter POS data, run
java -cp target/jcrfsuite-*.jar com.github.jcrfsuite.example.Train example/tweet-pos/train-oct27.txt twitter-pos.model
2) Tagging
To test the trained POS model against the test set, run
java -cp target/jcrfsuite-*.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 = 92.99%
Note that the accuracy might be slightly different than in the above output.