Package smile.base.cart

Enum Class SplitRule

java.lang.Object

java.lang.Enum<SplitRule>

smile.base.cart.SplitRule

All Implemented Interfaces:

Serializable, Comparable<SplitRule>, Constable

public enum SplitRule
extends Enum<SplitRule>

The criterion to choose variable to split instances.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
CLASSIFICATION_ERROR	Classification error.
ENTROPY	Used by the ID3, C4.5 and C5.0 tree generation algorithms.
GINI	Used by the CART algorithm, Gini impurity is a measure of how often a randomly chosen element from the set would be incorrectly labeled if it were randomly labeled according to the distribution of labels in the subset.

Method Summary

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

GINI

public static final SplitRule GINI

Used by the CART algorithm, Gini impurity is a measure of how often a randomly chosen element from the set would be incorrectly labeled if it were randomly labeled according to the distribution of labels in the subset. Gini impurity can be computed by summing the probability of each item being chosen times the probability of a mistake in categorizing that item. It reaches its minimum (zero) when all cases in the node fall into a single target category.

ENTROPY

public static final SplitRule ENTROPY

Used by the ID3, C4.5 and C5.0 tree generation algorithms.

CLASSIFICATION_ERROR

public static final SplitRule CLASSIFICATION_ERROR

Classification error.

Method Details

values

public static SplitRule[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

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

valueOf

public static SplitRule valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (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 class has no constant with the specified name

NullPointerException - if the argument is null