edu.cmu.minorthird.classify.sequential
Class CollinsPerceptronLearner

java.lang.Object
  edu.cmu.minorthird.classify.sequential.CollinsPerceptronLearner

All Implemented Interfaces:

BatchSequenceClassifierLearner, SequenceClassifierLearner, SequenceConstants

Direct Known Subclasses:

MarginPerceptronLearner, Recommended.VPTagLearner

public class CollinsPerceptronLearner
extends java.lang.Object
implements BatchSequenceClassifierLearner, SequenceConstants

Sequential learner based on the perceptron algorithm, as described in Discriminative Training Methods for Hidden Markov Models: Theory and Experiments with Perceptron Algorithms, Mike Collins, EMNLP 2002.

Author:

William Cohen

Nested Class Summary

static class

CollinsPerceptronLearner.MultiClassVPClassifier

Field Summary

protected static boolean	DEBUG
protected java.lang.String[]	history
protected int	historySize
protected static org.apache.log4j.Logger	log
protected int	numberOfEpochs

Fields inherited from interface edu.cmu.minorthird.classify.sequential.SequenceConstants

HISTORY_FEATURE, NULL_CLASS_NAME

Constructor Summary

CollinsPerceptronLearner()

CollinsPerceptronLearner(int numberOfEpochs)

CollinsPerceptronLearner(int historySize, int numberOfEpochs)

Method Summary

SequenceClassifier	batchTrain(SequenceDataset dataset)
int	getHistorySize() Return the number of previous predictions used as features in learning.
java.lang.String	getHistorySizeHelp()
int	getNumberOfEpochs()
void	setHistorySize(int newHistorySize)
void	setNumberOfEpochs(int newNumberOfEpochs)
void	setSchema(ExampleSchema schema)

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static org.apache.log4j.Logger log

DEBUG

protected static final boolean DEBUG

historySize

protected int historySize

numberOfEpochs

protected int numberOfEpochs

history

protected java.lang.String[] history

Constructor Detail

CollinsPerceptronLearner

public CollinsPerceptronLearner()

CollinsPerceptronLearner

public CollinsPerceptronLearner(int numberOfEpochs)

CollinsPerceptronLearner

public CollinsPerceptronLearner(int historySize,
                                int numberOfEpochs)

Method Detail

getNumberOfEpochs

public int getNumberOfEpochs()

setNumberOfEpochs

public void setNumberOfEpochs(int newNumberOfEpochs)

getHistorySize

public int getHistorySize()

Description copied from interface: SequenceClassifierLearner

Return the number of previous predictions used as features in learning.

Specified by:

getHistorySize in interface SequenceClassifierLearner

setHistorySize

public void setHistorySize(int newHistorySize)

getHistorySizeHelp

public java.lang.String getHistorySizeHelp()

setSchema

public void setSchema(ExampleSchema schema)

Specified by:

setSchema in interface SequenceClassifierLearner

batchTrain

public SequenceClassifier batchTrain(SequenceDataset dataset)

Specified by:

batchTrain in interface BatchSequenceClassifierLearner