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Neuron.h

Go to the documentation of this file.

#ifndef _NEURON_H
#define _NEURON_H

#include "Link.h"
#include "defines.h"
#include <string>

namespace annie
{

// Some activation functions and their derivatives

real identity(real x);
real didentity(real x);
real sigmoid(real x);
real dsigmoid(real x);
real gaussian(real x);
real dgaussian(real x);
real signum(real x);
real tansig(real x);
real dtansig(real x);

real random();

real random2();

int randomInt(int low, int high);


typedef real(*ActivationFunction)(real);

typedef std::vector<Link *> LINKS;

class Neuron
{
protected:
        int _label;

        bool _outputCacheValid;

        real _activationCache;
        real _outputCache;

        bool _errorCacheValid;
        real _errorCache;

        std::vector<char *> _classHeirarchy;

        LINKS _inputLinks;
public:
        LINKS _outputLinks;
protected:
        ActivationFunction _activationFunction;
        
        virtual void _recacheOutput()=0;

        virtual void _recacheError()=0;
        
public:
        Neuron(int label);

        Neuron(Neuron &neuron);

        virtual ~Neuron();

        virtual real getActivation();
        
        virtual real getOutput();

        virtual real getError();
        
        virtual int getLabel();

        virtual int getInputCount();

        virtual int getOutputCount();

        virtual void invalidateOutputCache();

        virtual void invalidateErrorCache();

        virtual int getInputs(std::vector<int> &labels, VECTOR &weights);

        virtual void disconnect(Neuron *from);

        virtual real getWeight(Neuron *from);

        virtual std::string toString();
        
        virtual const char *getClassName()=0;
        friend class Link;

        bool instanceOf(const char *className);

        friend std::ostream& operator << (std::ostream& s, Neuron &neuron);
};

}; //namespace annie
#endif // define _NEURON_H

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