HistogramIntersectionKernel.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) 2010 Koen van de Sande
 * Copyright (C) 2010 Koen van de Sande / University of Amsterdam
 */

#ifndef _HISTOGRAMINTERSECTIONKERNEL_H___
#define _HISTOGRAMINTERSECTIONKERNEL_H___

#include <shogun/lib/common.h>
#include <shogun/kernel/DotKernel.h>
#include <shogun/features/DenseFeatures.h>

namespace shogun
{
class CHistogramIntersectionKernel: public CDotKernel
{
    public:
        CHistogramIntersectionKernel();

        CHistogramIntersectionKernel(int32_t size);

        CHistogramIntersectionKernel(
            CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r,
            float64_t beta=1.0, int32_t size=10);

        virtual ~CHistogramIntersectionKernel();

        virtual bool init(CFeatures* l, CFeatures* r);
        /* register the parameters
         */
        virtual void register_params();

        virtual EKernelType get_kernel_type() { return K_HISTOGRAMINTERSECTION; }

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

        inline float64_t get_beta() { return m_beta; }

        inline void set_beta(float64_t beta) { m_beta = beta; }

    protected:

        float64_t m_beta;

        virtual float64_t compute(int32_t idx_a, int32_t idx_b);

};
}
#endif /* _HISTOGRAMINTERSECTIONKERNEL_H__ */