GaussianARDKernel.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) 2012 Jacob Walker
 *
 * Adapted from WeightedDegreeRBFKernel.h
 */

#ifndef GAUSSIANARDKERNEL_H_
#define GAUSSIANARDKERNEL_H_

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

namespace shogun
{

class CGaussianARDKernel: public CLinearARDKernel
{
public:
    CGaussianARDKernel();

    CGaussianARDKernel(int32_t size, float64_t width);

    CGaussianARDKernel(CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r,
        int32_t size=10, float64_t width=2.0);

    virtual ~CGaussianARDKernel();

    static CGaussianARDKernel* obtain_from_generic(CKernel* kernel);

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

    virtual EKernelType get_kernel_type() { return K_GAUSSIANARD; }

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

    virtual SGMatrix<float64_t> get_parameter_gradient(const TParameter* param,
            index_t index=-1);

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

private:
    void init();

protected:
    float64_t m_width;
};
}
#endif /* GAUSSIANARDKERNEL_H_ */