AnnealingGA.h

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#ifndef CANNEALINGGA_H
#define CANNEALINGGA_H
#include <vector>
#include "GeneralGA.h"
#include "VecMat.h"

/** \addtogroup gainv Genetic algorithm optimization */
/* @{ */
//! AnnealingGA implements a genetic algorithm with an annealing style objective function
/*! For the first AnnealingGeneration iterations the objective function is kept constant
 * after that the misfit is stretched  with an exponential annealing function  to focus on the minimum
 */
class AnnealingGA : public GeneralGA{
private:
        //! The initial "Temperature" for the Annealing function 
        double InitTemperature;
        //! Before AnnealingGeneration iterations the objective function stays constant
        int AnnealingGeneration;
        //! The ratio by which the temperature is decreased
        double AnnealingRatio;
protected:
        //! The implementation of Elitism for the AnnealingGA, in this case this function has no effect
        void virtual Elitism(const int iterationnumber);
public:
        //! The index of the best population member
        int GetBestIndex();
        //! Set the parameters for the annealing process
        void SetParams(const double InitT, const int AnnealG, const double AnnealR);
        //! How many best models exist in this iteration, for this GA it is always 1
        unsigned int virtual GetNBestmodels(){return 1;} // there is one best model in each iteration
        //! Return the vector containing the best indices, here it has always one component equal to GetBestIndex
        std::vector<int> virtual GetBestModelIndices(){return std::vector<int>(1,GetBestIndex());}
        //! Calculate the selection probabilities given the iterationnumber, misfit and population to store the results
        void virtual CalcProbabilities(const int iterationnumber, gplib::rmat &LocalMisFit, GeneralPopulation &LocalPopulation);
        //! The constructor only passes on the parameters to GeneralGA
        AnnealingGA(GeneralPropagation* const LocalPropagation, GeneralPopulation* const LocalPopulation, 
                GeneralTranscribe* const LocalTranscribe, const tObjectiveVector &IndObjective);
        virtual ~AnnealingGA();
};
/* @} */
#endif // CANNEALINGGA_H

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