GeneralLinearCombiner.h

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#ifndef CGENERALLINEARCOMBINER_H
#define CGENERALLINEARCOMBINER_H
#include <vector>
#include <boost/shared_ptr.hpp>

class GeneralNeuron;


/** \addtogroup neuralnet Neural Network filtering */
/* @{ */

//! A linear combiner as a component of a neural network
/*! It can cache the last output for faster calculation within the network, but this assumes that between every output calculation
  the weights are updated.
  */
class GeneralLinearCombiner{
public:
        typedef std::vector<boost::shared_ptr<GeneralNeuron> > tinvector;
private:
        //! The weight for each input channel
        std::vector<double> Weights;
        //! The current output
        double Output;
        //! A vector of pointers to other neurons, that provide the input for this combiner
        tinvector Input;
        //! The bias weight
        double Bias;
        //! have the weights changed since the last calculation ?
        bool wchanged;
        //! has the bias changed since the last calculation ?
        bool bchanged;
        //! do we want to cache the output or recalculate it every time
        bool cachedoutput;
public:
        //! Set the bias weigth
        void SetBias(const double b){bchanged = true; Bias = b;}
        //! Get the current value for the bias
        double GetBias() const {return Bias;}
        //! Get the values of the Weight vector
        const std::vector<double> &GetWeights() const {return Weights;}
        //! change the values of the Weight vector
        std::vector<double> &SetWeights(){wchanged = true; return Weights;}
        //! Calculate the output given the current configuration
        virtual double CalcOutput();
        //! connect the input channels to the neurons given in LocalInput
        virtual void SetInput(const tinvector &LocalInput);
        //! get the input channel configuration
        const tinvector &GetInput() const {return Input;} 
        explicit GeneralLinearCombiner(bool wantcached = false);
        virtual ~GeneralLinearCombiner();
};
/* @} */
#endif // CGENERALLINEARCOMBINER_H

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