aima.core.learning.learners

Class DecisionTreeLearner

java.lang.Object

aima.core.learning.learners.DecisionTreeLearner

All Implemented Interfaces:

Learner

Direct Known Subclasses:

StumpLearner

public class DecisionTreeLearner
extends java.lang.Object
implements Learner

Author:

Ravi Mohan, Mike Stampone

Constructor Summary

Constructors

Constructor and Description
DecisionTreeLearner()
DecisionTreeLearner(DecisionTree tree, java.lang.String defaultValue)

Method Summary

Modifier and Type	Method and Description
DecisionTree	getDecisionTree() Returns the decision tree of this decision tree learner
java.lang.String	predict(Example e) Returns the outcome predicted for the specified example
int[]	test(DataSet ds) Returns the accuracy of the hypothesis on the specified set of examples
void	train(DataSet ds) Induces the decision tree from the specified set of examples

Methods inherited from class java.lang.Object

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

Constructor Detail

DecisionTreeLearner

public DecisionTreeLearner()

DecisionTreeLearner

public DecisionTreeLearner(DecisionTree tree,
                           java.lang.String defaultValue)

Method Detail

train

public void train(DataSet ds)

Induces the decision tree from the specified set of examples

Specified by:

train in interface Learner

Parameters:

ds - a set of examples for constructing the decision tree

predict

public java.lang.String predict(Example e)

Description copied from interface: Learner

Returns the outcome predicted for the specified example

Specified by:

predict in interface Learner

Parameters:

e - an example

Returns:

the outcome predicted for the specified example

test

public int[] test(DataSet ds)

Description copied from interface: Learner

Returns the accuracy of the hypothesis on the specified set of examples

Specified by:

test in interface Learner

Parameters:

ds - the test data set.

Returns:

the accuracy of the hypothesis on the specified set of examples

getDecisionTree

public DecisionTree getDecisionTree()

Returns the decision tree of this decision tree learner

Returns:

the decision tree of this decision tree learner