Package cc.mallet.fst.confidence

Class TransducerSequenceConfidenceEstimator

java.lang.Object

cc.mallet.fst.confidence.TransducerSequenceConfidenceEstimator

Direct Known Subclasses:

MaxEntSequenceConfidenceEstimator, MinSegmentConfidenceEstimator, NBestViterbiConfidenceEstimator, QBCSequenceConfidenceEstimator, RandomSequenceConfidenceEstimator, SegmentProductConfidenceEstimator, ViterbiConfidenceEstimator, ViterbiRatioConfidenceEstimator

public abstract class TransducerSequenceConfidenceEstimator
extends java.lang.Object

Abstract class that estimates the confidence of a Sequence extracted by a Transducer.Note that this is different from TransducerConfidenceEstimator, which estimates the confidence for a single Segment.

Field Summary

Fields

Modifier and Type	Field	Description
protected Transducer	model

Constructor Summary

Constructors

Constructor	Description
TransducerSequenceConfidenceEstimator(Transducer model)

Method Summary

Modifier and Type	Method	Description
abstract double	estimateConfidenceFor(Instance instance, java.lang.Object[] startTags, java.lang.Object[] inTags)	Calculates the confidence in the tagging of a Sequence.
InstanceWithConfidence[]	rankInstancesByConfidence(InstanceList ilist, java.lang.Object[] startTags, java.lang.Object[] continueTags)	Ranks all Sequencess in this InstanceList by confidence estimate.

Methods inherited from class java.lang.Object

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

Field Detail

model

protected Transducer model

Constructor Detail

TransducerSequenceConfidenceEstimator

public TransducerSequenceConfidenceEstimator(Transducer model)

Method Detail

estimateConfidenceFor

public abstract double estimateConfidenceFor(Instance instance,
                                             java.lang.Object[] startTags,
                                             java.lang.Object[] inTags)

Calculates the confidence in the tagging of a Sequence.

rankInstancesByConfidence

public InstanceWithConfidence[] rankInstancesByConfidence(InstanceList ilist,
                                                          java.lang.Object[] startTags,
                                                          java.lang.Object[] continueTags)

Ranks all Sequencess in this InstanceList by confidence estimate.

Parameters:

ilist - list of segmentation instances

startTags - represent the labels for the start states (B-) of all segments

continueTags - represent the labels for the continue state (I-) of all segments

Returns:

array of InstanceWithConfidences ordered by non-decreasing confidence scores, as calculated by estimateConfidenceFor