jsat.classifiers.trees

Enum ImpurityScore.ImpurityMeasure

java.lang.Object

java.lang.Enum<ImpurityScore.ImpurityMeasure>

jsat.classifiers.trees.ImpurityScore.ImpurityMeasure

All Implemented Interfaces:

Serializable, Comparable<ImpurityScore.ImpurityMeasure>

Enclosing class:

ImpurityScore

public static enum ImpurityScore.ImpurityMeasure
extends Enum<ImpurityScore.ImpurityMeasure>

Different methods of measuring the impurity in a set of data points based on nominal class labels

Enum Constant Summary

Enum Constants

Enum Constant and Description
CLASSIFICATION_ERROR
GINI
INFORMATION_GAIN
INFORMATION_GAIN_RATIO
NMI Normalized Mutual Information.

Method Summary

Modifier and Type	Method and Description
static ImpurityScore.ImpurityMeasure	valueOf(String name) Returns the enum constant of this type with the specified name.
static ImpurityScore.ImpurityMeasure[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

INFORMATION_GAIN

public static final ImpurityScore.ImpurityMeasure INFORMATION_GAIN

INFORMATION_GAIN_RATIO

public static final ImpurityScore.ImpurityMeasure INFORMATION_GAIN_RATIO

NMI

public static final ImpurityScore.ImpurityMeasure NMI

Normalized Mutual Information. The ImpurityScore.getScore() value will be the same as INFORMATION_GAIN, however - the gain returned is considerably different - and is a normalization of the mutual information between the split and the class label by the class and split entropy.

GINI

public static final ImpurityScore.ImpurityMeasure GINI

CLASSIFICATION_ERROR

public static final ImpurityScore.ImpurityMeasure CLASSIFICATION_ERROR

Method Detail

values

public static ImpurityScore.ImpurityMeasure[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ImpurityScore.ImpurityMeasure c : ImpurityScore.ImpurityMeasure.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ImpurityScore.ImpurityMeasure valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null