dragon.ir.classification.multiclass

Class AllPairCodeMatrix

java.lang.Object

dragon.ir.classification.multiclass.AbstractCodeMatrix

dragon.ir.classification.multiclass.AllPairCodeMatrix

All Implemented Interfaces:

CodeMatrix, Serializable

public class AllPairCodeMatrix
extends AbstractCodeMatrix
implements Serializable

Pairwise Code Matrix

Any two categories combine as a binary classifer in which one category is trained as postive examples and the other negative examples. For a classification problem with n categories, there are total n(n-1)/2 binary classifiers.

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
AllPairCodeMatrix()
AllPairCodeMatrix(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

AllPairCodeMatrix

public AllPairCodeMatrix()

AllPairCodeMatrix

public AllPairCodeMatrix(int classNum)

Method Detail

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

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.