RandomKitchenSinksDotFeatures.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 _RANDOMKITCHENSINKS_DOT_FEATURES_H__
#define _RANDOMKITCHENSINKS_DOT_FEATURES_H__

#include <shogun/features/DotFeatures.h>

namespace shogun
{

class CRandomKitchenSinksDotFeatures : public CDotFeatures
{
public:

    CRandomKitchenSinksDotFeatures();

    CRandomKitchenSinksDotFeatures(CDotFeatures* dataset, int32_t K);

    CRandomKitchenSinksDotFeatures(CDotFeatures* dataset, int32_t K,
            SGMatrix<float64_t> coeff);

    CRandomKitchenSinksDotFeatures(CFile* loader);

    CRandomKitchenSinksDotFeatures(const CRandomKitchenSinksDotFeatures& orig);

    virtual CFeatures* duplicate() const;

    virtual ~CRandomKitchenSinksDotFeatures();

    virtual int32_t get_dim_feature_space() const;

    virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df,
            int32_t vec_idx2);

    virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2,
            int32_t vec2_len);

    virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1,
            float64_t* vec2, int32_t vec2_len, bool abs_val = false);

    virtual int32_t get_nnz_features_for_vector(int32_t num);

    virtual void* get_feature_iterator(int32_t vector_index);

    virtual bool get_next_feature(int32_t& index, float64_t& value,
            void* iterator);

    virtual void free_feature_iterator(void* iterator);

    virtual EFeatureType get_feature_type() const;

    virtual EFeatureClass get_feature_class() const;

    virtual int32_t get_num_vectors() const;    

    SGMatrix<float64_t> generate_random_coefficients();

    SGMatrix<float64_t> get_random_coefficients();

    const char* get_name() const; 

protected:
    virtual float64_t dot(index_t vec_idx, index_t par_idx);

    virtual float64_t post_dot(float64_t dot_result, index_t par_idx);

    virtual SGVector<float64_t> generate_random_parameter_vector()=0;
private:
    void init(CDotFeatures* dataset, int32_t K);

protected:

    CDotFeatures* feats;

    int32_t num_samples;

    SGMatrix<float64_t> random_coeff;
};
}

#endif // _RANDOMKITCHENSINKS_DOT_FEATURES_H__