dragon.ir.classification.multiclass

Class OVACodeMatrix

java.lang.Object

dragon.ir.classification.multiclass.AbstractCodeMatrix

dragon.ir.classification.multiclass.OVACodeMatrix

All Implemented Interfaces:

CodeMatrix, Serializable

public class OVACodeMatrix
extends AbstractCodeMatrix
implements Serializable

One-versus-all Code Matrix

For a classification problem with n categories, there are total n binary classifiers. For the k-th binary classifier, examples of category k will be used as postive examples and all other examples used as negative examples.

Copyright: Copyright (c) 2005

Company: IST, Drexel University

Version:

1.0

Author:

Davis Zhou

See Also:

Serialized Form

Field Summary

Fields inherited from class dragon.ir.classification.multiclass.AbstractCodeMatrix

classifierNum, classNum

Constructor Summary

Constructors

Constructor and Description
OVACodeMatrix()
OVACodeMatrix(int classNum)

Method Summary

Modifier and Type	Method and Description
int	getCode(int classIndex, int classifierIndex) Gets the code value for specified category and binary classifier
void	setClassNum(int classNum) Sets the number of categories

Methods inherited from class dragon.ir.classification.multiclass.AbstractCodeMatrix

getClassifierNum, getClassNum

Methods inherited from class java.lang.Object

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

Constructor Detail

OVACodeMatrix

public OVACodeMatrix()

OVACodeMatrix

public OVACodeMatrix(int classNum)

Method Detail

getCode

public int getCode(int classIndex,
                   int classifierIndex)

Description copied from interface: CodeMatrix

Gets the code value for specified category and binary classifier

Specified by:

getCode in interface CodeMatrix

Parameters:

classIndex - the index of the category

classifierIndex - the index of the binary classifier

Returns:

-1, 0, +1. -1 means the training examples of category i will be used as negative examples for the j-th binary classifier. +1 means the training examples of category i will be used as positive examples for the j-th binary classifier. O means not used for training.

setClassNum

public void setClassNum(int classNum)

Description copied from interface: CodeMatrix

Sets the number of categories

Specified by:

setClassNum in interface CodeMatrix

Parameters:

classNum - the number of categories