GenerateDatum.java

package com.digiburo.demo3;

import java.io.File;
import java.io.FileReader;
import java.io.BufferedReader;

import java.io.IOException; 
import java.io.FileNotFoundException;

import com.digiburo.backprop1.Pattern;
import com.digiburo.backprop1.PatternList;


/**
 * Convert txt files to serialized patterns 
 *
 * @author G.S. Cole (gsc@acm.org)
 * @version $Id: GenerateDatum.java,v 1.1 2002/02/03 04:24:05 gsc Exp $
 */

/*
 * Development Environment:
 *   Linux 2.2.14-5.0 (Red Hat 6.2)
 *   Java Developers Kit 1.3.1
 *
 * Legalise:  
 *   Copyright (C) 2002 Digital Burro, INC.
 *
 * Maintenance History:
 *   $Log: GenerateDatum.java,v $
 *   Revision 1.1  2002/02/03 04:24:05  gsc
 *   Initial Check In
 *
 */

public class GenerateDatum {
    private static final double one = 0.9999999999;
    private static final double zero = 0.0000000001;

    private static final String TRAIN_FILENAME = "demo3.trn";    
    
    private static final String FILE_PATH = "src/com/digiburo/demo3/";
    
    private static final String[] RAW_FILENAMES = { "zero_a.txt", "one_a.txt", "two_a.txt", "three_a.txt", "four_a.txt", "five_a.txt", "six_a.txt", "seven_a.txt", "eight_a.txt", "nine_a.txt" };

    /**
     * Read and return the ASCII pattern files as Pattern objects.
     */
    public void createTrainingSet() throws Exception {
	PatternList pl = new PatternList();

	double input[] = null;
	double output[] = new double[10];
	
	for (int ii = 0; ii < RAW_FILENAMES.length; ii++) {
	    output[ii] = zero;
	}

	for (int ii = 0; ii < RAW_FILENAMES.length; ii++) {
	    System.out.println(RAW_FILENAMES[ii]);
	    input = patternReader(FILE_PATH + RAW_FILENAMES[ii]);
	    if (ii == 0) {
		output[ii] = one;
	    } else {
		output[ii] = one;
		output[ii-1] = zero;
	    }

	    pl.add(input, output);
	}

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

    /**
     * Convert the ASCII file do an array of double suitable 
     * for input neurons
     *
     * @param file_name of file to read
     * @return file contents as array of double
     */
    private double[] patternReader(String file_name) {
	String raw_pattern = null;
	
	try {
	    BufferedReader br = new BufferedReader(new FileReader(file_name));
	    
	    String inbuffer;
	    while ((inbuffer = br.readLine()) != null) {
		if (raw_pattern == null) {
		    raw_pattern = inbuffer;
		} else {
		    raw_pattern += inbuffer;
		}
	    }
	    
	    br.close();
	} catch(Exception ee) {
	    ee.printStackTrace();
	}
	
	if (raw_pattern.length() != 25) {
	    throw new IllegalArgumentException("bad pattern length");
	}
	
	byte[] temp = raw_pattern.getBytes();
	
	double[] result = new double[25];
	for (int ii = 0; ii < 25; ii++) {
	    result[ii] = (temp[ii] == 0x20) ? zero: one;
	}
	
	return(result);
    }

    /**
     * Driver
     */
    public static void main(String args[]) throws Exception {
	System.out.println("begin");

	GenerateDatum gd = new GenerateDatum();
	gd.createTrainingSet();

	System.out.println("end");
    }
}