DistanceKernel.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) 2007-2009 Christian Gehl
 * Copyright (C) 2007-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#include <shogun/lib/config.h>

#ifndef _DISTANCEKERNEL_H___
#define _DISTANCEKERNEL_H___

#include <shogun/lib/common.h>
#include <shogun/kernel/Kernel.h>
#include <shogun/distance/Distance.h>

namespace shogun
{
    class CDistance;

class CDistanceKernel: public CKernel
{
    public:
        CDistanceKernel();

        CDistanceKernel(int32_t cache, float64_t width, CDistance* dist);

        CDistanceKernel(
            CFeatures *l, CFeatures *r, float64_t width, CDistance* dist);

        virtual ~CDistanceKernel();

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

        virtual void register_params();

        virtual EKernelType get_kernel_type() { return K_DISTANCE; }
        virtual EFeatureType get_feature_type() { return distance->get_feature_type(); }

        virtual EFeatureClass get_feature_class() { return distance->get_feature_class(); }

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

        virtual void set_width(float64_t w)
        {
            width=w;
        }

        virtual float64_t get_width() const
        {
            return width;
        }


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

        CDistance* distance;
        float64_t width;
};
}
#endif /* _DISTANCEKERNEL_H__ */