weka.classifiers.j48
Class PruneableDecList

java.lang.Object
  |
  +--weka.classifiers.j48.ClassifierDecList
        |
        +--weka.classifiers.j48.PruneableDecList

All Implemented Interfaces:

java.io.Serializable

public class PruneableDecList

extends ClassifierDecList

Class for handling a partial tree structure that can be pruned using a pruning set.

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

See Also:

Serialized Form

Fields inherited from class weka.classifiers.j48.ClassifierDecList

indeX, m_isEmpty, m_isLeaf, m_localModel, m_sons, m_test, m_toSelectModel, m_train

Constructor Summary

PruneableDecList(ModelSelection toSelectLocModel, int minNum)
Constructor for pruneable partial tree structure.

Method Summary

void	buildRule(Instances train, Instances test) Method for building a pruned partial tree.
int	chooseIndex() Method for choosing a subset to expand.
int	chooseLastIndex() Choose last index (ie.
protected ClassifierDecList	getNewDecList(Instances train, Instances test, boolean leaf) Returns a newly created tree.
protected void	pruneEnd() Prunes the end of the rule.

Methods inherited from class weka.classifiers.j48.ClassifierDecList

buildDecList, buildDecList, classifyInstance, cleanup, distributionForInstance, getNewDecList, toString, weight

Methods inherited from class java.lang.Object

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

Constructor Detail

PruneableDecList

public PruneableDecList(ModelSelection toSelectLocModel,
                        int minNum)

Constructor for pruneable partial tree structure.

Parameters:

toSelectLocModel - selection method for local splitting model

minNum - minimum number of objects in leaf

Method Detail

buildRule

public void buildRule(Instances train,
                      Instances test)
               throws java.lang.Exception

Method for building a pruned partial tree.

Throws:

java.lang.Exception - if tree can't be built successfully

chooseIndex

public final int chooseIndex()

Method for choosing a subset to expand.

Overrides:

chooseIndex in class ClassifierDecList

chooseLastIndex

public final int chooseLastIndex()

Choose last index (ie. choose rule).

Overrides:

chooseLastIndex in class ClassifierDecList

getNewDecList

protected ClassifierDecList getNewDecList(Instances train,
                                          Instances test,
                                          boolean leaf)
                                   throws java.lang.Exception

Returns a newly created tree.

Overrides:

getNewDecList in class ClassifierDecList

Parameters:

data - and selection method for local models.

Throws:

java.lang.Exception - if something goes wrong

pruneEnd

protected void pruneEnd()
                 throws java.lang.Exception

Prunes the end of the rule.

Overrides:

pruneEnd in class ClassifierDecList