example.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.mySVM.Examples;

public class Example{
    // !!!
    // sparse oder dense?
    // mit Kernel abkl?ren
    // evt. toDense() wg. print_w?
    public int[] index;
    public double[] att;

    public Example(){
	index=null;
	att=null;
    };

	public Example(double[] values) {
		
		index = new int[values.length];
		for(int i = 0; i < index.length; i++)
			index[i] = i;
		
		this.att = values;
		
	}

    public Example(int[] new_index, double[] new_att){
	index = new_index;
	att = new_att;
    };

    public double[] toDense(){
	double[] dense=null;
	if(index != null){
	    dense = new double[index[index.length-1] + 1];
	    int pos=0;
	    for(int i=0;i<dense.length;i++){
		while(pos < index[i]){
		    dense[pos] = 0.0;
		    pos++;
		};
		dense[pos] = att[i];
		pos++;
	    };
	};
	return dense;
    };

    public double[] toDense(int dim){
	double[] dense;
	dense = new double[dim];
	int pos=0;
	if(index != null){
	    for(int i=0;i<index.length;i++){
		while(pos < index[i]){
		    dense[pos] = 0.0;
		    pos++;
		};
		dense[pos] = att[i];
		pos++;
	    };
	};
	while(pos < dim){
	    dense[pos] = 0.0;
	    pos++;
	};
	return dense;
    };

    public String toString() {
	double[] dense = toDense();
	StringBuffer result = new StringBuffer();
	for (int i = 0; i < dense.length; i++) {
	    if (i != 0) result.append(" ");
	    result.append(dense[i]);
	}
	return result.toString();
    }
}