perceptron.java

java applet实现的bp神经网络和感知器

public class Perceptron {

    double x[];     //样本输入
    double yd[];    //样本标准
    double o[];
    double o1[];
    double o2[];    //输出
    double w[][];   //权值
    int inNum;      //输入节点数
    int outNum;     //输出节点数
    double e;

    public Perceptron(int inNum, int outNum) {
        this.inNum = inNum;
        this.outNum = outNum;
        x = new double[inNum]; //输入向量
        yd = new double[outNum];
        o = new double[outNum];
        o1 = new double[outNum];
        o2 = new double[outNum];
        w = new double[inNum][outNum];
        for (int i = 0; i < inNum; i++) {
            for (int j = 0; j < outNum; j++) {
                w[i][j] = 0.1 * Math.random();
            }
        }
    }

    public void train(double p[][], double t[][], int samplenum) {
        e = 0.0;
        for (int isamp = 0; isamp < samplenum; isamp++)//循环训练一次样本
        {
            for (int i = 0; i < inNum; i++) {
                x[i] = p[isamp][i];
            }
            for (int i = 0; i < outNum; i++) {
                yd[i] = t[isamp][i];
            }
            for (int j = 0; j < outNum; j++) {
                o[j] = 0.0;
                for (int i = 0; i < inNum; i++) {
                    o[j] = o[j] + w[i][j] * x[i];
                }
                if (o[j] > 1) {
                    o1[j] = 1;
                } else {
                    o1[j] = 0;
                }
                if (o1[j] != yd[j]) {
                    for (int i = 0; i < inNum; i++) {
                        w[i][j] = w[i][j] + 0.02 * (yd[j] - o1[j])*x[i];
                    }
                    e += (yd[j] - o1[j]) * (yd[j] - o1[j]);
                }
            }
        }
    }

    public double[] sim(double psim[]) {

        for (int i = 0; i < inNum; i++) {
            x[i] = psim[i];
        }
        for (int k = 0; k < outNum; k++) {
            o2[k] = 0.0;
            for (int j = 0; j < inNum; j++) {
                o2[k] = o2[k] + w[j][k] * x[j];
            }
            if (o2[k] > 1) {
                o2[k] = 1;
            } else {
                o2[k] = 0;
            }
        }

        return o2;
    } //end sim
}