examplevisualizationoperator.java

一个很好的LIBSVM的JAVA源码。对于要研究和改进SVM算法的学者。可以参考。来自数据挖掘工具YALE工具包。

/*
 *  YALE - Yet Another Learning Environment
 *  Copyright (C) 2001-2004
 *      Simon Fischer, Ralf Klinkenberg, Ingo Mierswa, 
 *          Katharina Morik, Oliver Ritthoff
 *      Artificial Intelligence Unit
 *      Computer Science Department
 *      University of Dortmund
 *      44221 Dortmund,  Germany
 *  email: [e-mail]
 *  web:   http://yale.cs.uni-dortmund.de/
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA.
 */
package edu.udo.cs.yale.operator;

import edu.udo.cs.yale.example.Attribute;
import edu.udo.cs.yale.example.YaleIdMapping;
import edu.udo.cs.yale.example.ExampleSet;
import edu.udo.cs.yale.example.ExampleReader;
import edu.udo.cs.yale.gui.ExampleVisualizer;

/** Generates a mapping between ids and examples (which doubles memory usage!) and
 *  initialized a simple object visualizer which displays the attribute values of the example. 
 *  This visualizer can be used in the plotter.
 *
 *  @version $Id: ExampleVisualizationOperator.java,v 2.3 2004/08/27 11:57:34 ingomierswa Exp $
 */
public class ExampleVisualizationOperator extends Operator {
    
    private static final Class[] INPUT_CLASSES = { ExampleSet.class };
    private static final Class[] OUTPUT_CLASSES = { ExampleSet.class };
    

    public IOObject[] apply() throws OperatorException {
	YaleIdMapping mapping = YaleIdMapping.getDefaultMapping();
	mapping.clear();
	
	ExampleSet exampleSet = (ExampleSet)getInput(ExampleSet.class, false);
	Attribute idAttribute = exampleSet.getIdAttribute();
	if (idAttribute == null) {
	    throw new UserError(this, 113, "Id");
	}
	ExampleReader reader = exampleSet.getExampleReader();
	while (reader.hasNext()) {
	    mapping.addObject(reader.next());
	}

	getExperiment().addObjectVisualizer(new ExampleVisualizer());

	return new IOObject[0];
    }

    public Class[] getInputClasses() { return INPUT_CLASSES; }
    public Class[] getOutputClasses() { return OUTPUT_CLASSES; }
}