edu.uci.jforests.learning.trees.decision

Class Entropy

java.lang.Object

edu.uci.jforests.learning.trees.decision.Entropy

public class Entropy
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
Entropy()

Method Summary

Modifier and Type	Method and Description
static double	getEntropy(double[] dist) Computes the entropy of a given distribution.
static double	getSplitEntropy(double[] leftDist, double[] rightDist)

Methods inherited from class java.lang.Object

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

Constructor Detail

Entropy

public Entropy()

Method Detail

getEntropy

public static double getEntropy(double[] dist)

Computes the entropy of a given distribution. Entropy is computed as sum(-ci/T log2(ci/T)), where ci is the i-th element in the distribution and T is the sum of these elements. The following method computes the above definition using a faster computation.

Parameters:

dist -

Returns:

getSplitEntropy

public static double getSplitEntropy(double[] leftDist,
                                     double[] rightDist)