edu.cmu.sphinx.linguist.language.ngram

Class InterpolatedLanguageModel

java.lang.Object

edu.cmu.sphinx.linguist.language.ngram.InterpolatedLanguageModel

All Implemented Interfaces:

LanguageModel, Configurable

public class InterpolatedLanguageModel
extends java.lang.Object
implements LanguageModel

Simple interpolated LM implementation.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	PROP_LANGUAGE_MODEL_WEIGHTS The property that defines the language models weights
static java.lang.String	PROP_LANGUAGE_MODELS The property that defines the language models to be interpolated.

Fields inherited from interface edu.cmu.sphinx.linguist.language.ngram.LanguageModel

PROP_DICTIONARY, PROP_LOCATION, PROP_MAX_DEPTH, PROP_UNIGRAM_WEIGHT

Constructor Summary

Constructors

Constructor and Description
InterpolatedLanguageModel()
InterpolatedLanguageModel(java.util.List<LanguageModel> languageModels, float[] floats)

Method Summary

Modifier and Type	Method and Description
void	allocate() Create the language model
void	deallocate() Deallocate resources allocated to this language model
int	getMaxDepth() Returns the maximum depth of the language model
float	getProbability(WordSequence wordSequence) Calculates probability p = w[1]*p[1] + w[2]*p[2] + ...
float	getSmear(WordSequence wordSequence) Gets the smear term for the given wordSequence.
java.util.Set<java.lang.String>	getVocabulary() Returns the set of words in the language model.
void	newProperties(PropertySheet ps) This method is called when this configurable component needs to be reconfigured.
void	onUtteranceEnd() Called on utterance end to clear cache if needed

Methods inherited from class java.lang.Object

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

Field Detail

PROP_LANGUAGE_MODELS

@S4ComponentList(type=LanguageModel.class)
public static final java.lang.String PROP_LANGUAGE_MODELS

The property that defines the language models to be interpolated.

See Also:

Constant Field Values

PROP_LANGUAGE_MODEL_WEIGHTS

@S4StringList
public static final java.lang.String PROP_LANGUAGE_MODEL_WEIGHTS

The property that defines the language models weights

See Also:

Constant Field Values

Constructor Detail

InterpolatedLanguageModel

public InterpolatedLanguageModel(java.util.List<LanguageModel> languageModels,
                                 float[] floats)

InterpolatedLanguageModel

public InterpolatedLanguageModel()

Method Detail

newProperties

public void newProperties(PropertySheet ps)
                   throws PropertyException

Description copied from interface: Configurable

This method is called when this configurable component needs to be reconfigured.

Specified by:

newProperties in interface Configurable

Parameters:

ps - a property sheet holding the new data

Throws:

PropertyException - if there is a problem with the properties.

allocate

public void allocate()
              throws java.io.IOException

Description copied from interface: LanguageModel

Create the language model

Specified by:

allocate in interface LanguageModel

Throws:

java.io.IOException - if error occurrs

deallocate

public void deallocate()
                throws java.io.IOException

Description copied from interface: LanguageModel

Deallocate resources allocated to this language model

Specified by:

deallocate in interface LanguageModel

Throws:

java.io.IOException - if error occurrs

getProbability

public float getProbability(WordSequence wordSequence)

Calculates probability p = w[1]*p[1] + w[2]*p[2] + ... (in log domain)

Specified by:

getProbability in interface LanguageModel

Parameters:

wordSequence - the wordSequence

Returns:

the probability of the word sequence in log base

See Also:

LanguageModel.getProbability(edu.cmu.sphinx.linguist.WordSequence)

getSmear

public float getSmear(WordSequence wordSequence)

Description copied from interface: LanguageModel

Gets the smear term for the given wordSequence. Used in LexTreeLinguist. See LexTreeLinguist.PROP_WANT_UNIGRAM_SMEAR for details.

Specified by:

getSmear in interface LanguageModel

Parameters:

wordSequence - the word sequence

Returns:

the smear term associated with this word sequence

getVocabulary

public java.util.Set<java.lang.String> getVocabulary()

Description copied from interface: LanguageModel

Returns the set of words in the language model. The set is unmodifiable.

Specified by:

getVocabulary in interface LanguageModel

Returns:

the unmodifiable set of words

getMaxDepth

public int getMaxDepth()

Description copied from interface: LanguageModel

Returns the maximum depth of the language model

Specified by:

getMaxDepth in interface LanguageModel

Returns:

the maximum depth of the language model

onUtteranceEnd

public void onUtteranceEnd()

Description copied from interface: LanguageModel

Called on utterance end to clear cache if needed

Specified by:

onUtteranceEnd in interface LanguageModel