RandomFourierDotFeatures.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) 2013 Evangelos Anagnostopoulos
 * Copyright (C) 2013 Evangelos Anagnostopoulos
 */

#ifndef _RANDOMFOURIER_DOTFEATURES__H__
#define _RANDOMFOURIER_DOTFEATURES__H__

#include <shogun/features/RandomKitchenSinksDotFeatures.h>
#include <shogun/features/DenseFeatures.h>
#include <shogun/features/DotFeatures.h>

namespace shogun
{
template <class ST> class CDenseFeatures;
class CDotFeatures;

enum KernelName
{
    GAUSSIAN,

    NOT_SPECIFIED   
};

class CRandomFourierDotFeatures : public CRandomKitchenSinksDotFeatures
{
public:

    CRandomFourierDotFeatures();

    CRandomFourierDotFeatures(CDotFeatures* features, int32_t D, KernelName kernel_name,
            SGVector<float64_t> params);

    CRandomFourierDotFeatures(CDotFeatures* features, int32_t D, KernelName kernel_name,
            SGVector<float64_t> params, SGMatrix<float64_t> coeff);

    CRandomFourierDotFeatures(CFile* loader);
    
    CRandomFourierDotFeatures(const CRandomFourierDotFeatures& orig);

    virtual CFeatures* duplicate() const;

    virtual ~CRandomFourierDotFeatures();

    virtual const char* get_name() const;

protected:

    virtual float64_t post_dot(float64_t dot_result, index_t par_idx);

    virtual SGVector<float64_t> generate_random_parameter_vector();

private:
    void init(KernelName kernel_name, SGVector<float64_t> params);

private:
    KernelName kernel;

    SGVector<float64_t> kernel_params;

    float64_t constant;
};
}

#endif // _RANDOMFOURIER_DOTFEATURES__H__