SigmoidNeuron.h

#ifndef SIGMOIDNEURON_H
#define SIGMOIDNEURON_H

#include "NeuralNetConfig.h"
#include "Neuron.h"

#include <iostream>
#include <string>

//namespace nnet added 15/08/06 by Mark Grimes (mark.grimes@bristol.ac.uk) for the LCFI vertex package
namespace nnet
{

class NeuralNet;

class NEURALNETDLL SigmoidNeuron :
        public Neuron
{
public:
        SigmoidNeuron(const int numberOfInputs,const double bias=-1.0,double response=1.0,const NeuralNet *parent=0);
        double response() const {return _response;}
        void setResponse(double response) {_response = response;}
        void destroy() const;
        Neuron *clone(const NeuralNet *parentNetwork) const;
        void outputRange(double &outputmin,double &outputmax) const
        { outputmin = 0.0; outputmax = 1.0;}


protected:
        ~SigmoidNeuron(void);
        double thresholdFunction(const double activation) const;
        double derivative(const double x) const;
        void serialiseExtra(std::ostream &os) const;
        std::string neuronType() const {return "SigmoidNeuron";}

private:
    SigmoidNeuron(const SigmoidNeuron &other); // Declared but not defined
        double _response;
};

}//namespace nnet

#endif