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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This is the stable version. Apart from bugfixes, this version
does not receive any other updates.
/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
/*
* NoSplit.java
* Copyright (C) 1999-2012 University of Waikato, Hamilton, New Zealand
*
*/
package weka.classifiers.trees.j48;
import weka.core.Instance;
import weka.core.Instances;
import weka.core.RevisionUtils;
/**
* Class implementing a "no-split"-split.
*
* @author Eibe Frank ([email protected])
* @version $Revision: 8034 $
*/
public final class NoSplit
extends ClassifierSplitModel{
/** for serialization */
private static final long serialVersionUID = -1292620749331337546L;
/**
* Creates "no-split"-split for given distribution.
*/
public NoSplit(Distribution distribution){
m_distribution = new Distribution(distribution);
m_numSubsets = 1;
}
/**
* Creates a "no-split"-split for a given set of instances.
*
* @exception Exception if split can't be built successfully
*/
public final void buildClassifier(Instances instances)
throws Exception {
m_distribution = new Distribution(instances);
m_numSubsets = 1;
}
/**
* Always returns 0 because only there is only one subset.
*/
public final int whichSubset(Instance instance){
return 0;
}
/**
* Always returns null because there is only one subset.
*/
public final double [] weights(Instance instance){
return null;
}
/**
* Does nothing because no condition has to be satisfied.
*/
public final String leftSide(Instances instances){
return "";
}
/**
* Does nothing because no condition has to be satisfied.
*/
public final String rightSide(int index, Instances instances){
return "";
}
/**
* Returns a string containing java source code equivalent to the test
* made at this node. The instance being tested is called "i".
*
* @param index index of the nominal value tested
* @param data the data containing instance structure info
* @return a value of type 'String'
*/
public final String sourceExpression(int index, Instances data) {
return "true"; // or should this be false??
}
/**
* Returns the revision string.
*
* @return the revision
*/
public String getRevision() {
return RevisionUtils.extract("$Revision: 8034 $");
}
}