RationalQuadraticKernel.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 Rafał Surowiecki
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
 */

#include <shogun/lib/config.h>

#ifndef RATIONAL_QUADRATIC_KERNEL_H_
#define RATIONAL_QUADRATIC_KERNEL_H_

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

namespace shogun
{

class CDistance;

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

    CRationalQuadraticKernel(int32_t cache, float64_t coef, CDistance* dist);

    CRationalQuadraticKernel(CFeatures *l, CFeatures *r, float64_t c, CDistance* dist);

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

    virtual EKernelType get_kernel_type() { return K_RATIONAL_QUADRATIC; }

    virtual EFeatureType get_feature_type() { return m_distance->get_feature_type(); }

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

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

    virtual const float64_t get_coef() const { return m_coef; }

    inline void set_coef(float64_t coef) { m_coef=coef; }

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

private:
    void init();

protected:
    CDistance* m_distance;

    float64_t m_coef;
};
}

#endif /* RATIONAL_QUADRATIC_KERNEL_H_ */