danbikel.parser.ms
Class SubcatModelStructure1

java.lang.Object
  danbikel.parser.ProbabilityStructure
      danbikel.parser.ms.SubcatModelStructure1

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

BrokenLeftSubcatModelStructure, BrokenRightSubcatModelStructure, LeftSubcatModelStructure1, RightSubcatModelStructure1

public abstract class SubcatModelStructure1
extends ProbabilityStructure

Provides the complete back-off structure of the subcat-generation model for either side of the head child.

The specific back-off structure provided by this class is:

• p( … | H, P, w_h, t_h)
• p( … | H, P, t)
• p( … | H, P)

See Also:

Serialized Form

Field Summary

Fields inherited from class danbikel.parser.ProbabilityStructure

additionalData, defaultModelClassName, defaultModelConstructor, doPruning, estimates, futureList, futures, futuresWithSubcats, histories, historiesWithSubcats, historyList, lambdas, prevHistCount, topLevelCacheSize, transitions

Constructor Summary

protected

SubcatModelStructure1()

Method Summary

Event	getHistory(TrainerEvent trainerEvent, int backOffLevel) Returns a history for the specified back-off level, according to the following zero-indexed list of history events.
double	lambdaFudge(int backOffLevel) Returns 0.0 regardlesss of back-off level.
double	lambdaFudgeTerm(int backOffLevel) Returns 5.0 regardlesss of back-off level.
int	maxEventComponents() Returns 4.
int	numLevels() Returns 3.

Methods inherited from class danbikel.parser.ProbabilityStructure

cacheSize, copy, defaultSmoothingParamsFilename, doCleanup, dontAddNewParameters, doPruning, getAdditionalData, getFuture, getTopLevelCacheSize, getTransition, jointModel, lambdaPenalty, newModel, priorLevel, removeFuture, removeHistory, removeTransition, saveSmoothingParameters, setAdditionalData, smoothingParametersFile, useSmoothingParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

SubcatModelStructure1

protected SubcatModelStructure1()

Method Detail

maxEventComponents

public int maxEventComponents()

Returns 4.

Overrides:

maxEventComponents in class ProbabilityStructure

Returns:

1 (subclasses should override this method)

See Also:

MutableEvent.ensureCapacity(int)

numLevels

public int numLevels()

Returns 3.

Specified by:

numLevels in class ProbabilityStructure

lambdaFudge

public double lambdaFudge(int backOffLevel)

Returns 0.0 regardlesss of back-off level.

Overrides:

lambdaFudge in class ProbabilityStructure

Parameters:

backOffLevel - the back-off level for which to return a "fudge factor"

lambdaFudgeTerm

public double lambdaFudgeTerm(int backOffLevel)

Returns 5.0 regardlesss of back-off level.

Overrides:

lambdaFudgeTerm in class ProbabilityStructure

getHistory

public Event getHistory(TrainerEvent trainerEvent,
                        int backOffLevel)

Returns a history for the specified back-off level, according to the following zero-indexed list of history events.

• p( … | H, P, w_h, t_h)
• p( … | H, P, t)
• p( … | H, P)

Specified by:

getHistory in class ProbabilityStructure

Parameters:

trainerEvent - the maximal-context event from which to derive the history events used by the various subcat models that are subclasses of this class

backOffLevel - the back-off level for which to get a history

Returns:

a history to condition on when generating a either a left or right subcat