Class HMMPOSTagger

java.lang.Object

smile.nlp.pos.HMMPOSTagger

All Implemented Interfaces:

Serializable, POSTagger

public class HMMPOSTagger
extends Object
implements POSTagger, Serializable

Part-of-speech tagging with hidden Markov model.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
HMMPOSTagger()	Constructor.

Method Summary

Modifier and Type	Method	Description
static HMMPOSTagger	fit(String[][] sentences, PennTreebankPOS[][] labels)	Fits an HMM POS tagger by maximum likelihood estimation.
static HMMPOSTagger	getDefault()	Returns the default English POS tagger (thread-safe lazy initialization).
static void	main(String[] args)	Train the default model on WSJ and BROWN datasets.
PennTreebankPOS[]	tag(String[] sentence)	Tags the sentence in the form of a sequence of words.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HMMPOSTagger

public HMMPOSTagger()

Constructor. Creates an empty model. For serialization only.

Method Details

getDefault

public static HMMPOSTagger getDefault()

Returns the default English POS tagger (thread-safe lazy initialization).

Returns:

the default English POS tagger, or null if the model resource could not be loaded.

tag

public PennTreebankPOS[] tag(String[] sentence)

Description copied from interface: POSTagger

Tags the sentence in the form of a sequence of words.

Specified by:

tag in interface POSTagger

Parameters:

sentence - the sentence.

Returns:

the POS tags.

fit

public static HMMPOSTagger fit(String[][] sentences,
 PennTreebankPOS[][] labels)

Fits an HMM POS tagger by maximum likelihood estimation.

Parameters:

sentences - the training sentences.

labels - the training labels.

Returns:

the model.

main

public static void main(String[] args)

Train the default model on WSJ and BROWN datasets.

Parameters:

args - the command line arguments.