edu.umd.hooka.alignment.hmm

Class HMM

java.lang.Object

edu.umd.hooka.alignment.AlignmentModel

edu.umd.hooka.alignment.model1.Model1Base

edu.umd.hooka.alignment.model1.Model1

edu.umd.hooka.alignment.hmm.HMM

Direct Known Subclasses:

HMM_NullWord

public class HMM
extends Model1

Represents an HMM that applies to a single sentence pair, which is derived from the parameters stored in a TTable and an ATable object.

Author:

redpony

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.hadoop.io.IntWritable	ACOUNT_VOC_ID

Fields inherited from class edu.umd.hooka.alignment.model1.Model1

tmodel

Fields inherited from class edu.umd.hooka.alignment.model1.Model1Base

_includeEnglishNullWord, maxF

Constructor Summary

Constructors

Modifier	Constructor and Description
	HMM(TTable ttable, ATable atable)
protected	HMM(TTable ttable, ATable atable, boolean useNull)

Method Summary

Methods

Modifier and Type	Method and Description
void	addPartialJumpCountsToATable(ATable ac)
float	baumWelch(PhrasePair pp, AlignmentPosteriorGrid pg)
void	buildHMMTables(PhrasePair pp)
AlignmentPosteriorGrid	computeAlignmentPosteriors(PhrasePair pp)
float	getEmissionProb(int j, int s)
int	getNumStates()
float	getTransitionProb(int s_prev, int s)
void	processTrainingInstance(PhrasePair pp, org.apache.hadoop.mapred.Reporter r)
void	setModel1Posteriors(AlignmentPosteriorGrid m1pg)
Alignment	viterbiAlign(PhrasePair sentence, PerplexityReporter reporter)
void	writePartialCounts(org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.IntWritable,PartialCountContainer> output)

Methods inherited from class edu.umd.hooka.alignment.model1.Model1

clearModel, realViterbiAlign

Methods inherited from class edu.umd.hooka.alignment.model1.Model1Base

addPartialTranslationCountsToTTable, addTranslationCount, addTranslationCount, getTranslationCoord, initializeCountTableForSentencePair

Methods inherited from class edu.umd.hooka.alignment.AlignmentModel

addAlignmentListener, notifyUnalignablePair

Methods inherited from class java.lang.Object

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

Field Detail

ACOUNT_VOC_ID

public static final org.apache.hadoop.io.IntWritable ACOUNT_VOC_ID

Constructor Detail

HMM

protected HMM(TTable ttable,
   ATable atable,
   boolean useNull)

HMM

public HMM(TTable ttable,
   ATable atable)

Method Detail

setModel1Posteriors

public void setModel1Posteriors(AlignmentPosteriorGrid m1pg)

writePartialCounts

public void writePartialCounts(org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.IntWritable,PartialCountContainer> output)
                        throws IOException

Overrides:

writePartialCounts in class Model1Base

Throws:

IOException

buildHMMTables

public void buildHMMTables(PhrasePair pp)

getNumStates

public final int getNumStates()

getTransitionProb

public final float getTransitionProb(int s_prev,
                      int s)

getEmissionProb

public final float getEmissionProb(int j,
                    int s)

addPartialJumpCountsToATable

public final void addPartialJumpCountsToATable(ATable ac)

processTrainingInstance

public void processTrainingInstance(PhrasePair pp,
                           org.apache.hadoop.mapred.Reporter r)

Overrides:

processTrainingInstance in class Model1

baumWelch

public final float baumWelch(PhrasePair pp,
              AlignmentPosteriorGrid pg)

Returns:

negative log probability of sentence

computeAlignmentPosteriors

public AlignmentPosteriorGrid computeAlignmentPosteriors(PhrasePair pp)

Overrides:

computeAlignmentPosteriors in class Model1

viterbiAlign

public Alignment viterbiAlign(PhrasePair sentence,
                     PerplexityReporter reporter)

Overrides:

viterbiAlign in class Model1