/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.operator.learner.tree;
import com.rapidminer.example.Attribute;
import com.rapidminer.example.ExampleSet;
import com.rapidminer.example.Statistics;
/**
* This criterion terminates if only one single label is left.
*
* @author Sebastian Land, Ingo Mierswa
* @version $Id: SingleLabelTermination.java,v 1.5 2008/05/09 19:22:52 ingomierswa Exp $
*/
public class SingleLabelTermination implements Terminator {
public SingleLabelTermination() {}
public boolean shouldStop(ExampleSet exampleSet, int depth) {
Attribute label = exampleSet.getAttributes().getLabel();
exampleSet.recalculateAttributeStatistics(label);
return exampleSet.size() == exampleSet.getStatistics(label, Statistics.COUNT, label.getMapping().mapIndex((int)exampleSet.getStatistics(label, Statistics.MODE)));
}
}