attributesetloader.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.io;

import edu.udo.cs.yale.operator.Operator;
import edu.udo.cs.yale.operator.IOObject;
import edu.udo.cs.yale.operator.OperatorException;
import edu.udo.cs.yale.operator.UserError;
import edu.udo.cs.yale.example.Attribute;
import edu.udo.cs.yale.example.AttributeParser;
import edu.udo.cs.yale.example.ExampleSet;
import edu.udo.cs.yale.operator.parameter.*;

import java.io.FileReader;
import java.util.List;
import java.util.Iterator;

/** Loads an attribute set from a file and constructs the desired features. Should be used instead of the
 *  {@link edu.udo.cs.yale.operator.preprocessing.FeatureGenerationOperator}.
 *
 *  @version $Id: AttributeSetLoader.java,v 1.3 2004/08/27 11:57:37 ingomierswa Exp $
 */
public class AttributeSetLoader extends Operator {

    private static final Class[] INPUT_CLASSES  = { ExampleSet.class };
    private static final Class[] OUTPUT_CLASSES = { ExampleSet.class };


    /** Loads the attribute set from a file and constructs desired features. */
    public IOObject[] apply() throws OperatorException {
	ExampleSet exampleSet = (ExampleSet)((ExampleSet)getInput(ExampleSet.class)).clone();

	String filename = getParameterAsString("attribute_set_file");
	try {
	    AttributeParser parser = new AttributeParser(exampleSet.getExampleTable());
	    
	    if (filename != null) {
		parser.parseAll(new FileReader(getExperiment().resolveFileName(filename)));
	    }
	    
	    parser.generateAll(exampleSet);

  	} catch (java.io.IOException e) {
  	    throw new UserError(this, e, 302, new Object[] {filename, e.getMessage()});
  	}

	return new IOObject[] { exampleSet };
    }

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

    public List getParameterTypes() {
	List types = super.getParameterTypes();
	types.add(new ParameterTypeFile("attribute_set_file", "Filename for the attribute set file.", false));
	return types;
    }

}