DotFeatures.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) 2009-2010 Soeren Sonnenburg
 * Copyright (C) 2009 Fraunhofer Institute FIRST and Max-Planck-Society
 * Copyright (C) 2010 Berlin Institute of Technology
 */

#ifndef _DOTFEATURES_H___
#define _DOTFEATURES_H___

#include <shogun/lib/config.h>

#include <shogun/lib/common.h>
#include <shogun/features/Features.h>
#include <shogun/lib/SGMatrix.h>

namespace shogun
{
class CDotFeatures : public CFeatures
{
    public:

        CDotFeatures(int32_t size=0);

        CDotFeatures(const CDotFeatures & orig);

        CDotFeatures(CFile* loader);

        virtual ~CDotFeatures() { }

        virtual int32_t get_dim_feature_space() const=0;

        virtual float64_t dot(int32_t vec_idx1, CDotFeatures* df, int32_t vec_idx2)=0;

        virtual float64_t dense_dot_sgvec(int32_t vec_idx1, const SGVector<float64_t> vec2);

        virtual float64_t dense_dot(int32_t vec_idx1, const float64_t* vec2, int32_t vec2_len)=0;

        virtual void add_to_dense_vec(float64_t alpha, int32_t vec_idx1, float64_t* vec2, int32_t vec2_len, bool abs_val=false)=0;

        virtual void dense_dot_range(float64_t* output, int32_t start, int32_t stop, float64_t* alphas, float64_t* vec, int32_t dim, float64_t b);

        virtual void dense_dot_range_subset(int32_t* sub_index, int32_t num,
                float64_t* output, float64_t* alphas, float64_t* vec, int32_t dim, float64_t b);

        static void* dense_dot_range_helper(void* p);

        virtual int32_t get_nnz_features_for_vector(int32_t num)=0;

        inline float64_t get_combined_feature_weight() { return combined_weight; }

        inline void set_combined_feature_weight(float64_t nw) { combined_weight=nw; }

        SGMatrix<float64_t> get_computed_dot_feature_matrix();

        SGVector<float64_t> get_computed_dot_feature_vector(int32_t num);

        void benchmark_add_to_dense_vector(int32_t repeats=5);

        void benchmark_dense_dot_range(int32_t repeats=5);

        virtual void* get_feature_iterator(int32_t vector_index)=0;

        virtual bool get_next_feature(int32_t& index, float64_t& value, void* iterator)=0;

        virtual void free_feature_iterator(void* iterator)=0;

        virtual SGVector<float64_t> get_mean();

        static SGVector<float64_t> get_mean(CDotFeatures* lhs, CDotFeatures* rhs);

        virtual SGMatrix<float64_t> get_cov();

        static SGMatrix<float64_t> compute_cov(CDotFeatures* lhs, CDotFeatures* rhs);

    protected:
        void display_progress(int32_t start, int32_t stop, int32_t v);

    private:
        void init();

    protected:

        float64_t combined_weight;
};
}
#endif // _DOTFEATURES_H___