GaussianShiftKernel.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) 2008 Gunnar Raetsch
 * Copyright (C) 2008-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _GAUSSIANSHIFTKERNEL_H___
#define _GAUSSIANSHIFTKERNEL_H___

#include <shogun/lib/config.h>

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

namespace shogun
{
class CGaussianShiftKernel: public CGaussianKernel
{
    public:
        CGaussianShiftKernel();

        CGaussianShiftKernel(
            int32_t size, float64_t width, int32_t max_shift,
            int32_t shift_step);

        CGaussianShiftKernel(
            CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r,
            float64_t width, int32_t max_shift, int32_t shift_step,
            int32_t size=10);

        virtual bool init(CFeatures* l, CFeatures* r)
        {
            return CGaussianKernel::init(l,r);
        }

        virtual ~CGaussianShiftKernel();

        virtual EKernelType get_kernel_type() { return K_GAUSSIANSHIFT; }

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

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

    private:
        void init();

    protected:
        int32_t max_shift;
        int32_t shift_step;
};
}
#endif /* _GAUSSIANSHIFTKERNEL_H__ */