ai

Class GiniFunction

java.lang.Object

ai.SplitFunction

ai.GiniFunction

All Implemented Interfaces:

Serializable

public class GiniFunction
extends SplitFunction

This class implements a split function based on the Gini coefficient

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
GiniFunction(int numOfFeatures, Random random) Constructs a Gini function (initialize it)

Method Summary

Modifier and Type	Method and Description
boolean	evaluate(weka.core.Instance instance) Evaluate a single instance based on the current state of the split function
void	init(weka.core.Instances data, ArrayList<Integer> indices) Create split function based on Gini coefficient
SplitFunction	newInstance()

Methods inherited from class java.lang.Object

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

Constructor Detail

GiniFunction

public GiniFunction(int numOfFeatures,
                    Random random)

Constructs a Gini function (initialize it)

Parameters:

numOfFeatures - number of features to use

random - random number generator

Method Detail

init

public void init(weka.core.Instances data,
                 ArrayList<Integer> indices)

Create split function based on Gini coefficient

Specified by:

init in class SplitFunction

Parameters:

data - original data

indices - indices of the samples to use

evaluate

public boolean evaluate(weka.core.Instance instance)

Evaluate a single instance based on the current state of the split function

Specified by:

evaluate in class SplitFunction

Parameters:

instance - sample to evaluate

Returns:

false if the instance is on the right of the splitting point, true if it's on the left

newInstance

public SplitFunction newInstance()

Specified by:

newInstance in class SplitFunction