LinearARDKernel.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.
 *
 * (W) 2012 Jacob Walker
 *
 * Adapted from WeightedDegreeRBFKernel.h
 *
 */

#ifndef LINEARARDKERNEL_H_
#define LINEARARDKERNEL_H_

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

namespace shogun
{

class CLinearARDKernel: public CDotKernel
{

public:
    CLinearARDKernel();

    CLinearARDKernel(int32_t size);

    CLinearARDKernel(CDenseFeatures<float64_t>* l, CDenseFeatures<float64_t>* r,
        int32_t size=10);

    virtual ~CLinearARDKernel();

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

    virtual EKernelType get_kernel_type() { return K_LINEARARD; }

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


    virtual EFeatureClass get_feature_class() { return C_DENSE; }

    virtual EFeatureType get_feature_type() { return F_DREAL; }

    virtual void set_weight(float64_t w, index_t i);

    virtual float64_t get_weight(index_t i);

    protected:

    virtual float64_t compute(int32_t idx_a, int32_t idx_b);

    void init_ft_weights();

    virtual SGMatrix<float64_t> get_parameter_gradient(TParameter* param,
            CSGObject* obj, index_t index);

private:

    void init();

protected:

    SGVector<float64_t> m_weights;
};

} /* namespace shogun */
#endif /* LINEARARDKERNEL_H_ */