Package weka.classifiers.trees.j48

Class EntropyBasedSplitCrit

java.lang.Object

weka.classifiers.trees.j48.SplitCriterion

weka.classifiers.trees.j48.EntropyBasedSplitCrit

All Implemented Interfaces:

Serializable, RevisionHandler

Direct Known Subclasses:

EntropySplitCrit, GainRatioSplitCrit, InfoGainSplitCrit

public abstract class EntropyBasedSplitCrit
extends SplitCriterion

"Abstract" class for computing splitting criteria based on the entropy of a class distribution.

Version:

$Revision: 10055 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
EntropyBasedSplitCrit()

Method Summary

Modifier and Type	Method	Description
final double	lnFunc(double num)	Help method for computing entropy.
final double	newEnt(Distribution bags)	Computes entropy of distribution after splitting.
final double	oldEnt(Distribution bags)	Computes entropy of distribution before splitting.
final double	splitEnt(Distribution bags)	Computes entropy after splitting without considering the class values.

Methods inherited from class weka.classifiers.trees.j48.SplitCriterion

splitCritValue, splitCritValue, splitCritValue, splitCritValue

Methods inherited from class java.lang.Object

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

Methods inherited from interface weka.core.RevisionHandler

getRevision

Constructor Details

EntropyBasedSplitCrit

public EntropyBasedSplitCrit()

Method Details

lnFunc

public final double lnFunc(double num)

Help method for computing entropy.

oldEnt

public final double oldEnt(Distribution bags)

Computes entropy of distribution before splitting.

newEnt

public final double newEnt(Distribution bags)

Computes entropy of distribution after splitting.

splitEnt

public final double splitEnt(Distribution bags)

Computes entropy after splitting without considering the class values.