CombinedDotFeatures.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 _COMBINEDDOTFEATURES_H___
#define _COMBINEDDOTFEATURES_H___

#include <shogun/lib/config.h>

#include <shogun/lib/common.h>
#include <shogun/lib/DynamicObjectArray.h>
#include <shogun/features/DotFeatures.h>

namespace shogun
{
class CFeatures;
class CDynamicObjectArray;
class CCombinedDotFeatures : public CDotFeatures
{
    public:
        CCombinedDotFeatures();

        CCombinedDotFeatures(const CCombinedDotFeatures & orig);

        virtual ~CCombinedDotFeatures();

        virtual int32_t get_num_vectors() const
        {
            return num_vectors;
        }

        virtual int32_t get_dim_feature_space() const
        {
            return  num_dimensions;
        }

        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 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);

        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 EFeatureType get_feature_type() const
        {
            return F_DREAL;
        }

        virtual EFeatureClass get_feature_class() const
        {
            return C_COMBINED_DOT;
        }

        #ifndef DOXYGEN_SHOULD_SKIP_THIS

        struct combined_feature_iterator
        {
            CDotFeatures* f;
            void* iterator;
            int32_t vector_index;
        };
        #endif

        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 CFeatures* duplicate() const;

        void list_feature_objs();

        CDotFeatures* get_feature_obj(int32_t idx);

        bool insert_feature_obj(CDotFeatures* obj, int32_t idx);

        bool append_feature_obj(CDotFeatures* obj);

        bool delete_feature_obj(int32_t idx);

        int32_t get_num_feature_obj();

        virtual SGVector<float64_t> get_subfeature_weights();

        virtual void set_subfeature_weights(SGVector<float64_t> weights);

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

    protected:
        void update_dim_feature_space_and_num_vec();

    private:
        void init();

    protected:
        CDynamicObjectArray* feature_array;

        int32_t iterator_idx;
        int32_t num_vectors;
        int32_t num_dimensions;
};
}
#endif // _DOTFEATURES_H___