edu.cmu.sphinx.decoder.search

Class ActiveListFactory

java.lang.Object

edu.cmu.sphinx.decoder.search.ActiveListFactory

All Implemented Interfaces:

Configurable

Direct Known Subclasses:

PartitionActiveListFactory, SimpleActiveListFactory, SortingActiveListFactory, WordActiveListFactory

public abstract class ActiveListFactory
extends java.lang.Object
implements Configurable

Creates new active lists.

Field Summary

Fields

Modifier and Type	Field and Description
protected int	absoluteBeamWidth
protected LogMath	logMath
protected float	logRelativeBeamWidth
static java.lang.String	PROP_ABSOLUTE_BEAM_WIDTH property that sets the desired (or target) size for this active list.
static java.lang.String	PROP_RELATIVE_BEAM_WIDTH Property that sets the minimum score relative to the maximum score in the list for pruning.
static java.lang.String	PROP_STRICT_PRUNING Property that indicates whether or not the active list will implement 'strict pruning'.

Constructor Summary

Constructors

Constructor and Description
ActiveListFactory()
ActiveListFactory(int absoluteBeamWidth, double relativeBeamWidth)

Method Summary

Modifier and Type	Method and Description
abstract ActiveList	newInstance() Creates a new active list of a particular type
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

Field Detail

PROP_ABSOLUTE_BEAM_WIDTH

@S4Integer(defaultValue=-1)
public static final java.lang.String PROP_ABSOLUTE_BEAM_WIDTH

property that sets the desired (or target) size for this active list. This is sometimes referred to as the beam size

See Also:

Constant Field Values

PROP_RELATIVE_BEAM_WIDTH

@S4Double(defaultValue=1.0E-80)
public static final java.lang.String PROP_RELATIVE_BEAM_WIDTH

Property that sets the minimum score relative to the maximum score in the list for pruning. Tokens with a score less than relativeBeamWidth * maximumScore will be pruned from the list

See Also:

Constant Field Values

PROP_STRICT_PRUNING

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

Property that indicates whether or not the active list will implement 'strict pruning'. When strict pruning is enabled, the active list will not remove tokens from the active list until they have been completely scored. If strict pruning is not enabled, tokens can be removed from the active list based upon their entry scores. The default setting is false (disabled).

See Also:

Constant Field Values

logMath

protected LogMath logMath

absoluteBeamWidth

protected int absoluteBeamWidth

logRelativeBeamWidth

protected float logRelativeBeamWidth

Constructor Detail

ActiveListFactory

public ActiveListFactory(int absoluteBeamWidth,
                         double relativeBeamWidth)

Parameters:

absoluteBeamWidth - beam for absolute pruning

relativeBeamWidth - beam for relative pruning

ActiveListFactory

public ActiveListFactory()

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.

newInstance

public abstract ActiveList newInstance()

Creates a new active list of a particular type

Returns:

the active list