opennlp.grok.preprocess.chunk
Class ChunkerME

java.lang.Object
  |
  +--opennlp.grok.preprocess.chunk.ChunkerME

All Implemented Interfaces:

opennlp.maxent.Evalable, opennlp.common.preprocess.Pipelink, opennlp.common.preprocess.POSTagger

Direct Known Subclasses:

EnglishChunkerME

public class ChunkerME

extends java.lang.Object

implements opennlp.maxent.Evalable, opennlp.common.preprocess.POSTagger

A shallow parser that uses maximum entropy. Trys to predict whether words are in chunks depending on their surrounding context.

Version:

$Revision: 1.2 $, $Date: 2002/11/08 17:57:10 $

Author:

Joerg Tiedemann

Field Summary

protected opennlp.maxent.MaxentModel	_chunkModel The maximum entropy model to use to evaluate contexts.
protected opennlp.common.util.FilterFcn	_closedClassTagsFilter Decides whether a word can be assigned a particular closed class tag.
protected opennlp.maxent.ContextGenerator	_contextGen The feature context generator.
protected boolean	_useClosedClassTagsFilter Says whether a filter should be used to check whether a tag assignment is to a word outside of a closed class.

Constructor Summary

protected	ChunkerME()
	ChunkerME(opennlp.maxent.MaxentModel mod)
	ChunkerME(opennlp.maxent.MaxentModel mod, opennlp.maxent.ContextGenerator cg)

Method Summary

java.util.List	bestSequence(java.util.List words, java.util.List pos)
opennlp.maxent.EventCollector	getEventCollector(java.io.Reader r)
java.lang.String	getNegativeOutcome()
void	localEval(opennlp.maxent.MaxentModel chunkModel, java.io.Reader r, opennlp.maxent.Evalable e, boolean verbose)
static void	main(java.lang.String[] args)
void	process(opennlp.common.xml.NLPDocument doc) creates chunk tags in a document.
void	processSimple(opennlp.common.xml.NLPDocument doc)
java.util.Set	requires()
java.util.List	tag(java.util.List sentence)
java.util.List	tag(java.util.List sentence, java.util.List pos)
java.lang.String	tag(java.lang.String sentence)
java.lang.String[]	tag(java.lang.String[] sentence)
java.lang.String	tagTest(java.lang.String sentence)

Methods inherited from class java.lang.Object

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

Field Detail

_chunkModel

protected opennlp.maxent.MaxentModel _chunkModel

The maximum entropy model to use to evaluate contexts.

_contextGen

protected opennlp.maxent.ContextGenerator _contextGen

The feature context generator.

_closedClassTagsFilter

protected opennlp.common.util.FilterFcn _closedClassTagsFilter

Decides whether a word can be assigned a particular closed class tag.

_useClosedClassTagsFilter

protected boolean _useClosedClassTagsFilter

Says whether a filter should be used to check whether a tag assignment is to a word outside of a closed class.

Constructor Detail

ChunkerME

protected ChunkerME()

ChunkerME

public ChunkerME(opennlp.maxent.MaxentModel mod)

ChunkerME

public ChunkerME(opennlp.maxent.MaxentModel mod,
                 opennlp.maxent.ContextGenerator cg)

Method Detail

getNegativeOutcome

public java.lang.String getNegativeOutcome()

Specified by:

getNegativeOutcome in interface opennlp.maxent.Evalable

getEventCollector

public opennlp.maxent.EventCollector getEventCollector(java.io.Reader r)

Specified by:

getEventCollector in interface opennlp.maxent.Evalable

process

public void process(opennlp.common.xml.NLPDocument doc)

creates chunk tags in a document.

Specified by:

process in interface opennlp.common.preprocess.Pipelink

processSimple

public void processSimple(opennlp.common.xml.NLPDocument doc)

tag

public java.util.List tag(java.util.List sentence,
                          java.util.List pos)

tag

public java.util.List tag(java.util.List sentence)

Specified by:

tag in interface opennlp.common.preprocess.POSTagger

tag

public java.lang.String[] tag(java.lang.String[] sentence)

Specified by:

tag in interface opennlp.common.preprocess.POSTagger

tag

public java.lang.String tag(java.lang.String sentence)

Specified by:

tag in interface opennlp.common.preprocess.POSTagger

tagTest

public java.lang.String tagTest(java.lang.String sentence)

localEval

public void localEval(opennlp.maxent.MaxentModel chunkModel,
                      java.io.Reader r,
                      opennlp.maxent.Evalable e,
                      boolean verbose)

Specified by:

localEval in interface opennlp.maxent.Evalable

bestSequence

public java.util.List bestSequence(java.util.List words,
                                   java.util.List pos)

requires

public java.util.Set requires()

Specified by:

requires in interface opennlp.common.preprocess.Pipelink

main

public static void main(java.lang.String[] args)
                 throws java.io.IOException

java.io.IOException