org.maltparser.ml.lib

Class FeatureMap

java.lang.Object

org.maltparser.ml.lib.FeatureMap

All Implemented Interfaces:

java.io.Serializable

public class FeatureMap
extends java.lang.Object
implements java.io.Serializable

The purpose of the feature map is to map MaltParser's column based features together with the symbol code from the symbol table to unique indices suitable for liblinear and libsvm. A feature column position are combined together with the symbol code in a 64-bit key (Long), where 16 bits are reserved for the position and 48 bits are reserved for the symbol code.

Author:

Johan Hall

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FeatureMap() Creates a feature map and sets the feature counter to 1

Method Summary

Modifier and Type	Method and Description
int	addIndex(int featurePosition, int code) Adds a mapping from a combination of the position in the column-based feature vector and the symbol code to an index value suitable for liblinear and libsvm.
int	addIndex(int featurePosition, int code1, int code2)
void	decrementfeatureCounter()
int	decrementIndex(java.lang.Long key)
int	getFeatureCounter()
int	getIndex(int featurePosition, int code) Return
int	getIndex(int featurePosition, int code1, int code2)
java.lang.Integer	removeIndex(long key)
java.lang.Long[]	reverseMap()
void	setFeatureCounter(int featureCounter)
int	setIndex(long key, int index)
int	size()

Methods inherited from class java.lang.Object

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

Constructor Detail

FeatureMap

public FeatureMap()

Creates a feature map and sets the feature counter to 1

Method Detail

addIndex

public int addIndex(int featurePosition,
                    int code)

Adds a mapping from a combination of the position in the column-based feature vector and the symbol code to an index value suitable for liblinear and libsvm.

Parameters:

featurePosition - a position in the column-based feature vector

code - a symbol code

Returns:

the index value

getIndex

public int getIndex(int featurePosition,
                    int code)

Return

Parameters:

featurePosition - the position in the column-based feature vector

code - the symbol code suitable for liblinear and libsvm

Returns:

the index value if it exists, otherwise -1

addIndex

public int addIndex(int featurePosition,
                    int code1,
                    int code2)

setIndex

public int setIndex(long key,
                    int index)

decrementIndex

public int decrementIndex(java.lang.Long key)

decrementfeatureCounter

public void decrementfeatureCounter()

removeIndex

public java.lang.Integer removeIndex(long key)

getIndex

public int getIndex(int featurePosition,
                    int code1,
                    int code2)

size

public int size()

Returns:

the size of the map

reverseMap

public java.lang.Long[] reverseMap()

setFeatureCounter

public void setFeatureCounter(int featureCounter)

getFeatureCounter

public int getFeatureCounter()

Returns:

the current value of the feature counter.