parameterset.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.operator.performance.PerformanceVector;
import edu.udo.cs.yale.operator.Operator;
import edu.udo.cs.yale.gui.SwingTools;
import edu.udo.cs.yale.Experiment;
import edu.udo.cs.yale.tools.LogService;

import java.util.Iterator;
import java.util.List;
import java.util.LinkedList;
import java.util.Map;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.io.IOException;
import java.io.BufferedReader;

/** A set of parameters generated by a <code>ParameterOptimizationOperator</code>.
 *  @version $Id: ParameterSet.java,v 2.6 2004/08/27 11:57:34 ingomierswa Exp $
 */
public class ParameterSet extends ResultObjectAdapter implements Saveable {

    private static class ParameterValue {
	private String operator;
	private String parameterKey;
	private String parameterValue;
	private ParameterValue(String operator, String parameterKey, String parameterValue) {
	    this.operator       = operator;
	    this.parameterKey   = parameterKey;
	    this.parameterValue = parameterValue;
	}
	public String toString() {
	    return operator + "." + parameterKey + "\t= " + parameterValue;
	}

	public void apply(Experiment experiment, Map nameMap) {
	    String opName = (String)nameMap.get(operator);
	    if (opName == null) opName = operator;
	    LogService.logMessage("Setting parameter '"+parameterKey+"' of operator '"+opName+
				  "' to '"+parameterValue+"'.",
				  LogService.MINIMUM);
	    Operator operator = experiment.getOperator(opName);
	    if (operator == null) {
		LogService.logMessage("No such operator: '"+opName+"'.", LogService.MINIMUM);
	    } else {
		operator.getParameters().setParameter(parameterKey, parameterValue);
	    }
	}
    }

    private List parameterValues = new LinkedList();
    private PerformanceVector performance;

    /** Private constructor for the read() method. */    
    private ParameterSet() { }

    /** Constructs a new ParameterSet. The three arrays must have equal length.
     *  For each <i>i</i>, the ParameterSet specifies the value <code>values[i]</code>
     *  for the parameter <code>parameters[i]</code> of the operator named 
     *  <code>operators[i]</code>. */
    public ParameterSet(Operator[] operators, 
			String[] parameters, 
			String[] values, 
			PerformanceVector value) {
	if ((operators.length != parameters.length) || 
	    (operators.length != values.length)) {
	    throw new IllegalArgumentException("The arrays operators, parameters, and values must be of equal size!");
	}
	for (int i = 0; i < operators.length; i++) {
	    parameterValues.add(new ParameterValue(operators[i].getName(), parameters[i], values[i]));
	}
	this.performance = value;
    }

    public String getName() {
	return "ParameterSet";
    }

    public String getParameterString() {
	StringBuffer str = new StringBuffer();
	Iterator i =  parameterValues.iterator();
	while (i.hasNext()) {
	    str.append(i.next().toString()+"\n");
	}
	return str.toString();
    }

    public String toString() { 
	String str = "Parameter set:\n";
	str += getParameterString();
	str += "\nPerformance: " + performance;
	return str;
    }

    /** Returns the performance of this parameter set.
     *  Attension: This may be null if the ParameterSet was read from a file. */
    public PerformanceVector getPerformance() {
	return performance;
    }

    /** Applies all parameters in the set to their operators.
     *  The entries in the nameMap can be
     *  used if the names of the operators in two experiments (one parameter optimisation
     *  experiment and one application experiment) are not the same.
     *  Each entry in nameMap maps the name read from the file to the name of the operator
     *  in the experiment. */
    public void applyAll(Experiment experiment, Map nameMap) {
	Iterator i =  parameterValues.iterator();
	while (i.hasNext()) {
	    ((ParameterValue)i.next()).apply(experiment, nameMap);
	}
    }

    public void save(File file) throws IOException {
	write(new PrintWriter(new FileWriter(file)));
    }


    public void write(PrintWriter writer) {
	writer.println("# Generated by "+getClass().getName());
	writer.println(getParameterString());
	writer.flush();
    }

    /** Reads a parameter set from a file. */
    public static ParameterSet read(BufferedReader reader) throws IOException {
	ParameterSet parameterSet = new ParameterSet();
	String line = null;
	while ((line = reader.readLine()) != null) {
	    line = line.trim();
	    if ((line.length() == 0) || (line.startsWith("#"))) continue;
	    int colon = line.indexOf(".");
	    int equals = line.indexOf("=");
	    if ((colon < 0) || (equals < 0) || (colon > equals))
		throw new IOException("Malformed line: "+line);
	    parameterSet.parameterValues.add(new ParameterValue(line.substring(0, colon).trim(),
								line.substring(colon+1, equals).trim(),
								line.substring(equals+1).trim()));
	}
	reader.close();
	return parameterSet;
    }
}