edu.cmu.sphinx.decoder.search

Class TokenSearchManager

java.lang.Object

edu.cmu.sphinx.decoder.search.TokenSearchManager

All Implemented Interfaces:

SearchManager, Configurable

Direct Known Subclasses:

SimpleBreadthFirstSearchManager, WordPruningBreadthFirstSearchManager

public abstract class TokenSearchManager
extends java.lang.Object
implements SearchManager

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	buildWordLattice
protected boolean	keepAllTokens
static java.lang.String	PROP_BUILD_WORD_LATTICE The property that specifies whether to build a word lattice.
static java.lang.String	PROP_KEEP_ALL_TOKENS The property that controls whether or not we keep all tokens.

Constructor Summary

Constructors

Constructor and Description
TokenSearchManager()

Method Summary

Modifier and Type	Method and Description
protected Token	getResultListPredecessor(Token token) Find the token to use as a predecessor in resultList given a candidate predecessor.
void	newProperties(PropertySheet ps) This method is called when this configurable component needs to be reconfigured.

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.cmu.sphinx.decoder.search.SearchManager

allocate, deallocate, recognize, startRecognition, stopRecognition

Field Detail

PROP_BUILD_WORD_LATTICE

@S4Boolean(defaultValue=true)
public static final java.lang.String PROP_BUILD_WORD_LATTICE

The property that specifies whether to build a word lattice.

See Also:

Constant Field Values

PROP_KEEP_ALL_TOKENS

@S4Boolean(defaultValue=false)
public static final java.lang.String PROP_KEEP_ALL_TOKENS

The property that controls whether or not we keep all tokens. If this is set to false, only word tokens are retained, otherwise all tokens are retained.

See Also:

Constant Field Values

buildWordLattice

protected boolean buildWordLattice

keepAllTokens

protected boolean keepAllTokens

Constructor Detail

TokenSearchManager

public TokenSearchManager()

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.

getResultListPredecessor

protected Token getResultListPredecessor(Token token)

Find the token to use as a predecessor in resultList given a candidate predecessor. There are three cases here:

• We want to store everything in resultList. In that case keepAllTokens is set to true and we just store everything that was built before.
• We are only interested in sequence of words. In this case we just keep word tokens and ignore everything else. In this case timing and scoring information is lost since we keep scores in emitting tokens.
• We want to keep words but we want to keep scores to build a lattice from the result list later and buildWordLattice is set to true. In this case we want to insert intermediate token to store the score and this token will be used during lattice path collapse to get score on edge. See Lattice for details of resultList compression.

Parameters:

token - the token of interest

Returns:

the immediate successor word token