edu.cmu.minorthird.classify.sequential
Class SegmentCRFLearner

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

All Implemented Interfaces:

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

public class SegmentCRFLearner
extends CRFLearner
implements BatchSegmenterLearner, SequenceConstants, Segmenter

Sequential learner based on the CRF algorithm. Source for the iitb.CRF package available from http://crf.sourceforge.net. This class implements the semi-markov version of CRF

Author:

Sunita Sarawagi

See Also:

Serialized Form

Nested Class Summary

class

SegmentCRFLearner.SemiMTFeatureGenImpl

Nested classes/interfaces inherited from class edu.cmu.minorthird.classify.sequential.CRFLearner

CRFLearner.MTFeatureGenImpl

Field Summary

Fields inherited from class edu.cmu.minorthird.classify.sequential.CRFLearner

maxItersHelp, useHighPrecisionArithmeticHelp

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

HISTORY_FEATURE, NULL_CLASS_NAME

Constructor Summary

SegmentCRFLearner()

SegmentCRFLearner(java.lang.String args)

Method Summary

Segmenter	batchTrain(SegmentDataset dataset)
java.lang.String	explain(CandidateSegmentGroup g) Return some string that 'explains' the classification
Segmentation	segmentation(CandidateSegmentGroup g) Return a predicted type for each element of the sequence.

Methods inherited from class edu.cmu.minorthird.classify.sequential.CRFLearner

batchTrain, classification, explain, getExplanation, getHistorySize, getMaxIters, getMaxItersHelp, getSchema, getUseHighPrecisionArithmetic, getUseHighPrecisionArithmeticHelp, removeLogSpaceOption, setLogSpaceOption, setMaxIters, setSchema, setUseHighPrecisionArithmetic, toGUI

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.cmu.minorthird.classify.sequential.BatchSegmenterLearner

setSchema

Constructor Detail

SegmentCRFLearner

public SegmentCRFLearner()

SegmentCRFLearner

public SegmentCRFLearner(java.lang.String args)

Method Detail

batchTrain

public Segmenter batchTrain(SegmentDataset dataset)

Specified by:

batchTrain in interface BatchSegmenterLearner

segmentation

public Segmentation segmentation(CandidateSegmentGroup g)

Return a predicted type for each element of the sequence.

Specified by:

segmentation in interface Segmenter

explain

public java.lang.String explain(CandidateSegmentGroup g)

Return some string that 'explains' the classification

Specified by:

explain in interface Segmenter