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

protected Transducer

model

Constructor Summary

TransducerSequenceConfidenceEstimator(Transducer model)

Method Summary

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