FKFeatures.h

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Written (W) 1999-2009 Soeren Sonnenburg
 * Written (W) 1999-2008 Gunnar Raetsch
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _CFKFEATURES__H__
#define _CFKFEATURES__H__

#include <shogun/features/DenseFeatures.h>
#include <shogun/distributions/HMM.h>

namespace shogun
{

template <class T> class CDenseFeatures;
class CHMM;

class CFKFeatures: public CDenseFeatures<float64_t>
{
    public:
        CFKFeatures();

        CFKFeatures(int32_t size, CHMM* p, CHMM* n);

        CFKFeatures(const CFKFeatures &orig);

        virtual ~CFKFeatures();

        void set_models(CHMM* p, CHMM* n);

        inline void set_a(float64_t a)
        {
            weight_a=a;
        }

        inline float64_t get_a()
        {
            return weight_a;
        }

        virtual float64_t* set_feature_matrix();

        float64_t set_opt_a(float64_t a=-1);

        inline float64_t get_weight_a() { return weight_a; };

        inline virtual const char* get_name() const { return "FKFeatures"; }

    protected:
        virtual float64_t* compute_feature_vector(
            int32_t num, int32_t& len, float64_t* target=NULL);

        void compute_feature_vector(float64_t* addr, int32_t num, int32_t& len);

        float64_t deriv_a(float64_t a, int32_t dimension=-1) ;

    private:
        void init();

    protected:
        CHMM* pos;
        CHMM* neg;
        float64_t* pos_prob;
        float64_t* neg_prob;
        float64_t weight_a;
};
}
#endif