GenerateDatum.java

package com.digiburo.demo1;

import java.io.File;

import com.digiburo.backprop1.PatternList;
import com.digiburo.backprop1.MathSupport;

/**
 * Generate training patterns for BpDemo1.
 *
 * @author G.S. Cole (gsc@acm.org)
 * @version $Id: GenerateDatum.java,v 1.4 2002/02/02 08:27:27 gsc Exp $
 */

/*
 * Development Environment:
 *   Linux 2.2.12-20 (Red Hat 6.1)
 *   Java Developers Kit 1.2.2-RC2-K
 *
 * Legalise:  
 *   Copyright (C) 2002 Digital Burro, INC.
 *
 * Maintenance History:
 *   $Log: GenerateDatum.java,v $
 *   Revision 1.4  2002/02/02 08:27:27  gsc
 *   Work In Progress
 *
 *   Revision 1.3  2002/02/01 05:09:59  gsc
 *   Tweaks from Unit Testing
 *
 *   Revision 1.2  2002/01/22 08:19:35  gsc
 *   Work In Progress
 *
 *   Revision 1.1  2002/01/21 03:04:11  gsc
 *   Initial Check In
 */

public class GenerateDatum {
    public static final double above = 0.9999999999;
    public static final double below = 0.0000000001;

    private static final int MAX_CANDIDATES = 250;
    private static final String TRAIN_FILENAME = "demo1.trn";
    
    private PatternList pl = new PatternList();
    
    /**
     * Generate random points and the correct output
     */
    public void createTrainingSet() throws Exception {
	for (int ii = 0; ii < MAX_CANDIDATES; ii++) {
	    double result;
	    double x1, y1, y2;
	    
	    x1 = MathSupport.boundedRandom(0.0, 1.0);
	    y1 = MathSupport.boundedRandom(0.0, 1.0);
	    
	    y2 = -5 * x1 + 2;
	    
	    result = (y1 < y2) ? below:above;
	    
	    double[] input = new double[2];
	    input[0] = x1;
	    input[1] = y1;
	    
	    double[] output = new double[1];
	    output[0] = result;

	    pl.add(input, output);
	    
	    //	    System.out.println(x1 + " " + y1 + " " + result);
	}

	pl.writer(new File(TRAIN_FILENAME));
    }

    /**
     * Driver
     */
    public static void main(String args[]) throws Exception {
	System.out.println("begin");
	GenerateDatum gd = new GenerateDatum();
	gd.createTrainingSet();
	System.out.println("end");
    }
}