ExponentialKernel.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.
 *
 * Gaussian Kernel used as template, attribution:
 * Written (W) 1999-2010 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 * Copyright (C) 2010 Berlin Institute of Technology
 *
 * Slightly edited by Justin Patera 2011
 */

#ifndef _EXPONENTIALKERNEL_H___
#define _EXPONENTIALKERNEL_H___

#include <shogun/lib/config.h>

#include <shogun/lib/common.h>
#include <shogun/kernel/DotKernel.h>
#include <shogun/features/DotFeatures.h>
#include <shogun/distance/Distance.h>

namespace shogun
{
    class CDotFeatures;
class CExponentialKernel: public CDotKernel
{
    public:
        CExponentialKernel();

        CExponentialKernel(CDotFeatures* l, CDotFeatures* r,
            float64_t width, CDistance* distance, int32_t size);

        virtual ~CExponentialKernel();

        virtual bool init(CFeatures* l, CFeatures* r);

        virtual void cleanup();

        virtual EKernelType get_kernel_type() { return K_EXPONENTIAL; }

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

        virtual float64_t get_width() const
        {
            return m_width;
        }

    protected:
        virtual float64_t compute(int32_t idx_a, int32_t idx_b);

        virtual void load_serializable_post() throw (ShogunException);

    private:
        void init();

    protected:
        CDistance* m_distance;
        float64_t m_width;
};
}
#endif /* _EXPONENTIALKERNEL_H__ */