PyramidChi2.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) 2008-2009 Alexander Binder
 * Copyright (C) 2008-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef PYRAMIDCHI2_H_
#define PYRAMIDCHI2_H_

#include <shogun/lib/config.h>

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

namespace shogun
{
    template <class T> class CDenseFeatures;

class CPyramidChi2 : public CDotKernel
{
public:
    CPyramidChi2();

    CPyramidChi2(int32_t size, int32_t num_cells2,
        float64_t* weights_foreach_cell2,
        int32_t width_computation_type2,
        float64_t width2);

    CPyramidChi2(
        CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r,
        int32_t size, int32_t num_cells2,
        float64_t* weights_foreach_cell2,
        int32_t width_computation_type2,
        float64_t width2 );

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


    virtual ~CPyramidChi2();

    virtual void cleanup();

    virtual EKernelType get_kernel_type()
    {
        return K_PYRAMIDCHI2;
    }

    virtual const char* get_name() const { return "PyramidChi2"; }


    virtual void setparams_pychi2(int32_t num_cells2,
        float64_t* weights_foreach_cell2,
        int32_t width_computation_type2,
        float64_t width2);

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

protected:

    int32_t num_cells;

    float64_t* weights;

    int32_t width_computation_type;
    float64_t width;
    int32_t num_randfeats_forwidthcomputation;




};
}
#endif /*PYRAMIDCHI2_H_*/