dragon.nlp.tool

Class BrillTagger

java.lang.Object

dragon.nlp.tool.AbstractTagger

dragon.nlp.tool.BrillTagger

All Implemented Interfaces:

Tagger

public class BrillTagger
extends AbstractTagger
implements Tagger

Java version of Brill's Part-of-Speech Tagger

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, please visit http://www.gnu.org/copyleft/gpl.html

Copyright: Copyright (c) 2005

Company: IST, Drexel University

Version:

1.0

Author:

Jimmy Lin, Davis Zhou

Field Summary

Fields inherited from interface dragon.nlp.tool.Tagger

POS_ADJECTIVE, POS_ADVERB, POS_CC, POS_DT, POS_IN, POS_NOUN, POS_NUM, POS_PRONOUN, POS_VERB

Constructor Summary

Constructors

Constructor and Description
BrillTagger()
BrillTagger(String dataDir)

Method Summary

Modifier and Type	Method and Description
void	close() Close the opened resources
protected int	getPOSIndex(String pos, Word word)
void	initialize(String bigramFile, String crFile, String lrFile, String lexiconFile) Initialize the tagger
static void	main(String[] args)
void	tag(Sentence sent) This method will tag the part of speech of all words in the sentence.
String	tag(String sentence) The native function to call brill's POS tagger

Methods inherited from class dragon.nlp.tool.AbstractTagger

isConjunction

Methods inherited from class java.lang.Object

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

Constructor Detail

BrillTagger

public BrillTagger()

BrillTagger

public BrillTagger(String dataDir)

Method Detail

main

public static void main(String[] args)

tag

public void tag(Sentence sent)

Description copied from interface: Tagger

This method will tag the part of speech of all words in the sentence. One can call the method getPOSIndex and getPOSLabel to get the part of speech of a word. Different taggers may use different tag names. For this reason, it is required to translate the tag names to a numerical POS label called POSIndex.

Specified by:

tag in interface Tagger

Parameters:

sent - the sentence for tagging

getPOSIndex

protected int getPOSIndex(String pos,
                          Word word)

Overrides:

getPOSIndex in class AbstractTagger

initialize

public void initialize(String bigramFile,
                       String crFile,
                       String lrFile,
                       String lexiconFile)

Initialize the tagger

Parameters:

bigramFile - the bigram file

crFile - the contextual rule file

lrFile - the lexicon rule file

lexiconFile - the lexicon file

close

public void close()

Close the opened resources

tag

public String tag(String sentence)

The native function to call brill's POS tagger

Parameters:

sentence - the sentence in the representation of a string

Returns:

the tagged string