WaveletKernel.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) 2011 Siddharth Kherada
 * Copyright (C) 2007-2011 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _WAVELETKERNEL_H___
#define _WAVELETKERNEL_H___

#include <shogun/lib/config.h>

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

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

        CWaveletKernel(int32_t size, float64_t Wdilation, float64_t Wtranslation);

        CWaveletKernel(CDotFeatures* l, CDotFeatures* r, int32_t size,float64_t Wdilation, float64_t Wtranslation);

        virtual ~CWaveletKernel();

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

        virtual void cleanup();

        virtual EKernelType get_kernel_type() { return K_WAVELET; }

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

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

    protected:
        inline float64_t MotherWavelet(float64_t h)
        {
            return cos(1.75*h)*exp(-h*h/2);
        }

    private:
        void init();

    protected:
        float64_t Wdilation;
        float64_t Wtranslation;
};
}
#endif /* _WAVELETKERNEL_H__ */