testinputfunction.java

神经网络源代码,实现了一个BP神经网络,可以完成基于BP的神经网络算法.

package net.openai.ai.nn.input;

import java.util.*;
import net.openai.ai.nn.network.*;

public class TestInputFunction extends InputFunction {

    //  this method will get all the neurons connections and 
    //  calculate the input for this neuron.
    public final void calculateInput(Neuron neuron) {
	double input = 0;
	boolean hasFromConnections = false;
	Vector connections = neuron.getConnections();
	int size = connections.size();
	for(int i = 0; i < size; i++) {
	    Connection connection = (Connection) connections.elementAt(i);
	    if(!neuron.equals(connection.getToNeuron()))
		continue;
	    hasFromConnections = true;
	    Neuron fromNeuron = connection.getFromNeuron();
	    Weight weight = connection.getWeight();
	    input += (fromNeuron.getOutput() * weight.getValue());
	    //db("Upstream Output: " + fromNeuron.getOutput());
	    //db("Weight value:    " + weight.getValue());
	}
	if(hasFromConnections)
	    neuron.setInput(input);
    }
}