edu.cmu.minorthird.classify.sequential
Class CRFLearner

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

All Implemented Interfaces:

BatchSequenceClassifierLearner, SequenceClassifier, SequenceClassifierLearner, SequenceConstants, Visible, java.io.Serializable

Direct Known Subclasses:

SegmentCRFLearner

public class CRFLearner
extends java.lang.Object
implements BatchSequenceClassifierLearner, SequenceConstants, SequenceClassifier, Visible, java.io.Serializable

Sequential learner based on the CRF algorithm. Source for the iitb.CRF package available from http://crf.sourceforge.net.

Author:

Sunita Sarawagi

See Also:

Serialized Form

Nested Class Summary

class

CRFLearner.MTFeatureGenImpl

Field Summary

java.lang.String	maxItersHelp
java.lang.String	useHighPrecisionArithmeticHelp

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

HISTORY_FEATURE, NULL_CLASS_NAME

Constructor Summary

CRFLearner()

CRFLearner(java.lang.String args)

CRFLearner(java.lang.String[] args)

CRFLearner(java.lang.String args, int histsize)

Method Summary

SequenceClassifier	batchTrain(SequenceDataset dataset)
ClassLabel[]	classification(Instance[] sequence) Return a predicted type for each element of the sequence.
java.lang.String	explain(Instance[] sequence) Return some string that 'explains' the classification
Explanation	getExplanation(Instance[] sequence) Return and explanation for a classification
int	getHistorySize() Return the number of previous predictions used as features in learning.
int	getMaxIters()
java.lang.String	getMaxItersHelp()
ExampleSchema	getSchema()
boolean	getUseHighPrecisionArithmetic()
java.lang.String	getUseHighPrecisionArithmeticHelp()
void	removeLogSpaceOption()
void	setLogSpaceOption()
void	setMaxIters(int newMaxIters)
void	setSchema(ExampleSchema schema)
void	setUseHighPrecisionArithmetic(boolean newUseHighPrecisionArithmetic)
Viewer	toGUI() Create a view of this object

Methods inherited from class java.lang.Object

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

Field Detail

maxItersHelp

public java.lang.String maxItersHelp

useHighPrecisionArithmeticHelp

public java.lang.String useHighPrecisionArithmeticHelp

Constructor Detail

CRFLearner

public CRFLearner()

CRFLearner

public CRFLearner(java.lang.String args)

CRFLearner

public CRFLearner(java.lang.String args,
                  int histsize)

CRFLearner

public CRFLearner(java.lang.String[] args)

Method Detail

setLogSpaceOption

public void setLogSpaceOption()

removeLogSpaceOption

public void removeLogSpaceOption()

setSchema

public void setSchema(ExampleSchema schema)

Specified by:

setSchema in interface SequenceClassifierLearner

getSchema

public ExampleSchema getSchema()

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

setMaxIters

public void setMaxIters(int newMaxIters)

getMaxIters

public int getMaxIters()

getMaxItersHelp

public java.lang.String getMaxItersHelp()

getUseHighPrecisionArithmetic

public boolean getUseHighPrecisionArithmetic()

setUseHighPrecisionArithmetic

public void setUseHighPrecisionArithmetic(boolean newUseHighPrecisionArithmetic)

getUseHighPrecisionArithmeticHelp

public java.lang.String getUseHighPrecisionArithmeticHelp()

batchTrain

public SequenceClassifier batchTrain(SequenceDataset dataset)

Specified by:

batchTrain in interface BatchSequenceClassifierLearner

classification

public ClassLabel[] classification(Instance[] sequence)

Return a predicted type for each element of the sequence.

Specified by:

classification in interface SequenceClassifier

explain

public java.lang.String explain(Instance[] sequence)

Return some string that 'explains' the classification

Specified by:

explain in interface SequenceClassifier

getExplanation

public Explanation getExplanation(Instance[] sequence)

Description copied from interface: SequenceClassifier

Return and explanation for a classification

Specified by:

getExplanation in interface SequenceClassifier

toGUI

public Viewer toGUI()

Description copied from interface: Visible

Create a view of this object

Specified by:

toGUI in interface Visible