edu.berkeley.nlp.lm

Class AbstractNgramLanguageModel<W>

java.lang.Object

edu.berkeley.nlp.lm.AbstractNgramLanguageModel<W>

All Implemented Interfaces:

NgramLanguageModel<W>, java.io.Serializable

Direct Known Subclasses:

AbstractArrayEncodedNgramLanguageModel, AbstractContextEncodedNgramLanguageModel

public abstract class AbstractNgramLanguageModel<W>
extends java.lang.Object
implements NgramLanguageModel<W>, java.io.Serializable

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface edu.berkeley.nlp.lm.NgramLanguageModel

NgramLanguageModel.StaticMethods

Field Summary

Fields

Modifier and Type	Field and Description
protected int	lmOrder
protected float	oovWordLogProb Fixed constant returned when computing the log probability for an n-gram whose last word is not in the vocabulary.

Constructor Summary

Constructors

Constructor and Description
AbstractNgramLanguageModel(int lmOrder, WordIndexer<W> wordIndexer, float oovWordLogProb)

Method Summary

Modifier and Type	Method and Description
int	getLmOrder() Maximum size of n-grams stored by the model.
WordIndexer<W>	getWordIndexer() Each LM must have a WordIndexer which assigns integer IDs to each word W in the language.
void	setOovWordLogProb(float oovWordLogProb) Sets the (log) probability for an OOV word.

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.berkeley.nlp.lm.NgramLanguageModel

getLogProb, scoreSentence

Field Detail

lmOrder

protected final int lmOrder

oovWordLogProb

protected float oovWordLogProb

Fixed constant returned when computing the log probability for an n-gram whose last word is not in the vocabulary. Note that this is different from the log prob of the unk tag probability.

Constructor Detail

AbstractNgramLanguageModel

public AbstractNgramLanguageModel(int lmOrder,
                                  WordIndexer<W> wordIndexer,
                                  float oovWordLogProb)

Method Detail

getLmOrder

public int getLmOrder()

Description copied from interface: NgramLanguageModel

Maximum size of n-grams stored by the model.

Specified by:

getLmOrder in interface NgramLanguageModel<W>

Returns:

getWordIndexer

public WordIndexer<W> getWordIndexer()

Description copied from interface: NgramLanguageModel

Each LM must have a WordIndexer which assigns integer IDs to each word W in the language.

Specified by:

getWordIndexer in interface NgramLanguageModel<W>

Returns:

setOovWordLogProb

public void setOovWordLogProb(float oovWordLogProb)

Description copied from interface: NgramLanguageModel

Sets the (log) probability for an OOV word. Note that this is in general different from the log prob of the unk tag probability.

Specified by:

setOovWordLogProb in interface NgramLanguageModel<W>