examplesource.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.operator.parameter.*;
import edu.udo.cs.yale.example.Attribute;
import edu.udo.cs.yale.example.ExampleSet;
import edu.udo.cs.yale.example.DataRowReader;
import edu.udo.cs.yale.example.FileDataRowReader;
import edu.udo.cs.yale.example.ExampleReader;
import edu.udo.cs.yale.example.ExampleTable;
import edu.udo.cs.yale.example.MemoryExampleTable;
import edu.udo.cs.yale.example.SkipNANExampleReader;
import edu.udo.cs.yale.example.DataRowFactory;
import edu.udo.cs.yale.example.SimpleExampleSet;
import edu.udo.cs.yale.tools.LogService;
import edu.udo.cs.yale.tools.att.AttributeDataSource;
import edu.udo.cs.yale.tools.att.AttributeDataSources;
import edu.udo.cs.yale.tools.att.AttributeSet;

import java.io.File;
import java.io.IOException;
import java.io.FileReader;
import java.util.Iterator;
import java.util.List;
import java.util.LinkedList;
import org.w3c.dom.*;
import org.xml.sax.*;
import javax.xml.parsers.*;

/** This operator reads an example set from (a) file(s). The files are parsed by StreamTokenizers
 *  which can use several delimiter characters and can ignore given characters totally.
 *  Additionally you can specify comment characters and can use " and ' as quote characters.
 *  <br/>
 *  Probably you can use the default values for the most file formats. Please refer to 
 *  section {@yale.ref sec:inputfiles|First steps/File formats} for details on the
 *  attribute description file set by the parameter <var>attributes</var> used to specify 
 *  attribute types. 
 *
 *  @yale.xmlclass ExampleSource
 *  @see edu.udo.cs.yale.operator.ExampleSetIterator
 *  @author Simon, Ingo
 *  @version $Id: ExampleSource.java,v 1.2 2004/08/27 11:57:37 ingomierswa Exp $
 *
 */
public class ExampleSource extends Operator {

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

    private String attributes;
    private int maxLines;
    private char[] separators;
    private char[] toIgnore;
    private char[] comments;
    private int dataRowType;

    public IOObject[] apply() throws OperatorException {

	attributes  = getParameterAsString("attributes");
	maxLines    = getParameterAsInt("sample_size");
  	separators  = getParameterAsString("separator_chars").toCharArray();
  	toIgnore    = getParameterAsString("ignore_chars").toCharArray();
  	comments    = getParameterAsString("comment_chars").toCharArray();
	dataRowType = getParameterAsInt("datamanagement");

	AttributeDataSources attributeDataSources = null;
	FileDataRowReader reader = null;
	try {
	    attributeDataSources = AttributeDataSource.createAttributeDataSources(getExperiment().resolveFileName(attributes), true);

	    reader = new FileDataRowReader(new DataRowFactory(dataRowType),
					   attributeDataSources.getDataSources(),
					   maxLines,
					   separators,
  					   comments,
  					   toIgnore);
	} catch (IOException e) {
	    throw new UserError(this, e, 302, new Object[] {attributes,e.getMessage()});
	} catch (edu.udo.cs.yale.tools.XMLException e) {
	    throw new UserError(this, e, 401, e.getMessage());
	} catch (ParserConfigurationException e) {
	    throw new UserError(this, e, 401, e.toString());
	} catch (SAXException e) {
	    throw new UserError(this, e, 401, e.toString());
	}

	AttributeSet attributeSet = new AttributeSet(attributeDataSources);

	ExampleTable table = new MemoryExampleTable(attributeSet.getAllAttributes(), reader);
	ExampleSet result = table.createExampleSet(attributeSet);
	if (result.getSize() == 0) {
	    throw new UserError(this, 117);
	}
	return new IOObject[] { result };
    }

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


    public List getParameterTypes() {
	List types = super.getParameterTypes();
	types.add(new ParameterTypeAttributeFile("attributes", "Filename for the xml attribute description file. This file also contains the names of the files to read the data from.", false));
	ParameterType type = new ParameterTypeInt("sample_size", "The maximum number of examples to read from the data files (-1 = all)", -1, Integer.MAX_VALUE, -1);
	type.setExpert(false);
	types.add(type);
	types.add(new ParameterTypeCategory("datamanagement", "Determines, how the data is represented internally.",
					    DataRowFactory.TYPE_NAMES, DataRowFactory.TYPE_DOUBLE_ARRAY));
	types.add(new ParameterTypeString("separator_chars", "Column separators for data files", ",;"));
	types.add(new ParameterTypeString("ignore_chars", "Characters that are ignored in the data files", ""));
	types.add(new ParameterTypeString("comment_chars", "Lines beginning with these characters are ignored.", "#"));
	return types;
    }
}