Package smile.base.cart

Class Split

java.lang.Object

smile.base.cart.Split

Direct Known Subclasses:

NominalSplit, OrdinalSplit

public abstract class Split
extends Object

The data about of a potential split for a leaf node.

Field Summary

Fields

Modifier and Type	Field	Description
static final Comparator<Split>	comparator	The comparator on the split score.

Constructor Summary

Constructors

Constructor	Description
Split(LeafNode leaf, int feature, double score, int lo, int hi, int trueCount, int falseCount)	Constructor.

Method Summary

Modifier and Type	Method	Description
abstract IntPredicate	predicate()	Returns the lambda that tests on the split feature.
abstract InternalNode	toNode(Node trueChild, Node falseChild)	Returns an internal node with the feature, value, and score of this split.
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

comparator

public static final Comparator<Split> comparator

The comparator on the split score.

Constructor Details

Split

public Split(LeafNode leaf,
 int feature,
 double score,
 int lo,
 int hi,
 int trueCount,
 int falseCount)

Constructor.

Parameters:

leaf - the node to split.

feature - the index of feature column.

score - the split score.

lo - the lower bound of sample index in the node.

hi - the upper bound of sample index in the node.

trueCount - the number of samples in true branch child.

falseCount - the number of samples false branch child.

Method Details

toNode

public abstract InternalNode toNode(Node trueChild,
 Node falseChild)

Returns an internal node with the feature, value, and score of this split.

Parameters:

trueChild - the child node of true branch.

falseChild - the child node of false branch.

Returns:

an internal node

predicate

public abstract IntPredicate predicate()

Returns the lambda that tests on the split feature.

Returns:

the lambda that tests on the split feature.

toString

public String toString()

Overrides:

toString in class Object