非学习型单层感知机的java实现（日志三）

要求如下：

所以当神经元输出函数选择在硬极函数的时候，如果想分成上面的四个类型，则必须要2个神经元，其实至于所有的分类问题，n个神经元则可以分成2的n次方类型。

又前一节所证明出来的关系有：

从而算出了所有的权重的值。。

代码实现如下：

第一个类是用来操实际操作的类，真正核心的内容是在PerceptronClassifyNoLearn中。

package com.cgrj.com;

import java.util.Arrays;

import org.neuroph.core.data.DataSet;
import org.neuroph.core.data.DataSetRow;
import org.neuroph.nnet.Perceptron;

public class MyNeturol {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        DataSet trainingSet=new DataSet(2,2);
        trainingSet.addRow(new DataSetRow(new double[]{1,2},new double[]{Double.NaN,Double.NaN}));
        trainingSet.addRow(new DataSetRow(new double[]{1,1},new double[]{Double.NaN,Double.NaN}));
        trainingSet.addRow(new DataSetRow(new double[]{2,0},new double[]{Double.NaN,Double.NaN}));
        trainingSet.addRow(new DataSetRow(new double[]{2,-1},new double[]{Double.NaN,Double.NaN}));
        trainingSet.addRow(new DataSetRow(new double[]{-1,2},new double[]{Double.NaN,Double.NaN}));
        trainingSet.addRow(new DataSetRow(new double[]{-2,1},new double[]{Double.NaN,Double.NaN}));
        trainingSet.addRow(new DataSetRow(new double[]{-1,-1},new double[]{Double.NaN,Double.NaN}));
        trainingSet.addRow(new DataSetRow(new double[]{-2,-2},new double[]{Double.NaN,Double.NaN}));

        PerceptronClassifyNoLearn perceptronClassifyNoLearn=new PerceptronClassifyNoLearn(2);

        for(DataSetRow row:trainingSet.getRows()){
            perceptronClassifyNoLearn.setInput(row.getInput());
            perceptronClassifyNoLearn.calculate();
            double[] netWorkOutput=perceptronClassifyNoLearn.getOutput();
            System.out.println(Arrays.toString(row.getInput())+"="+Arrays.toString(netWorkOutput));

        }

    }

}

PerceptronClassifyNoLearn规定了输入层和输出层的属性和规则，由于是无法学的，所以其判定规则是依然设定好了的，在此类中。

package com.cgrj.com;

import org.neuroph.core.Layer;
import org.neuroph.core.NeuralNetwork;
import org.neuroph.core.Neuron;
import org.neuroph.nnet.comp.neuron.BiasNeuron;
import org.neuroph.nnet.comp.neuron.InputNeuron;
import org.neuroph.util.ConnectionFactory;
import org.neuroph.util.LayerFactory;
import org.neuroph.util.NeuralNetworkFactory;
import org.neuroph.util.NeuralNetworkType;
import org.neuroph.util.NeuronProperties;
import org.neuroph.util.TransferFunctionType;

public class PerceptronClassifyNoLearn extends NeuralNetwork {

        public PerceptronClassifyNoLearn(int inputNeuronsCount){
            this.createNetWork(inputNeuronsCount);

        }

        private void createNetWork(int inputNeuronsCount) {
            //设置网络感知机
            this.setNetworkType(NeuralNetworkType.PERCEPTRON);

            //构建输入神经元，表示输入的刺激
            NeuronProperties inputNeuronProperties=new NeuronProperties();
            inputNeuronProperties.setProperty("neuronType", InputNeuron.class);

            //由输入神经元构成的输入层
            Layer inputLayer=LayerFactory.createLayer(inputNeuronsCount,inputNeuronProperties);
            this.addLayer(inputLayer);
            //给输入层增加BiasNeron,表示神经元偏置
            inputLayer.addNeuron(new BiasNeuron());

            //构建输出神经元
            NeuronProperties outputNeuronProperties=new NeuronProperties();
            outputNeuronProperties.setProperty("transferFunction", TransferFunctionType.STEP);
            Layer outputLayer=LayerFactory.createLayer(2, outputNeuronProperties);
            this.addLayer(outputLayer);

            ConnectionFactory.fullConnect(inputLayer, outputLayer);
            NeuralNetworkFactory.setDefaultIO(this);
            Neuron n=outputLayer.getNeuronAt(0);
            n.getInputConnections()[0].getWeight().setValue(-3);
            n.getInputConnections()[1].getWeight().setValue(-1);
            n.getInputConnections()[2].getWeight().setValue(1);

            n=outputLayer.getNeuronAt(1);
            n.getInputConnections()[0].getWeight().setValue(1);
            n.getInputConnections()[1].getWeight().setValue(-2);
            n.getInputConnections()[2].getWeight().setValue(0);

        }
}

可以应用于象限的判定，修改上面的代码如下：

Neuron n=outputLayer.getNeuronAt(0);
            n.getInputConnections()[0].getWeight().setValue(0);
            n.getInputConnections()[1].getWeight().setValue(1);
            n.getInputConnections()[2].getWeight().setValue(0);

            n=outputLayer.getNeuronAt(1);
            n.getInputConnections()[0].getWeight().setValue(1);
            n.getInputConnections()[1].getWeight().setValue(0);
            n.getInputConnections()[2].getWeight().setValue(0);

则有第一个用来判定位于y的方向，第一个神经元则用来判定位于x轴的方向

switch (Arrays.toString(netWorkOutput)) {
            case "[1.0, 1.0]":
                str="第一象限";
                break;
            case "[0.0, 1.0]":
                str="第四象限";
                break;
            case "[1.0, 0.0]":
                str="第二象限";
                break;
            case "[0.0, 0.0]":
                str="第三象限";
                break;

            default:
                break;
            }

            System.out.println(Arrays.toString(row.getInput())+"="+Arrays.toString(netWorkOutput)+"---属于"+str);

这样就会有打印的结果了。。

运行截图（这里忽略坐标轴的影响，由于输出函数的特殊，所以把0当成负数看）：

下一篇，将具体分析每个类和每个方法的含义，及其实现的原理。。。