StreamingDotFeatures.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) 2011 Shashwat Lal Das
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
 */
#ifndef _STREAMING_DOTFEATURES__H__
#define _STREAMING_DOTFEATURES__H__

#include <shogun/lib/common.h>
#include <shogun/features/streaming/StreamingFeatures.h>
#include <shogun/features/DotFeatures.h>
#include <shogun/io/streaming/StreamingFile.h>

namespace shogun
{
class CStreamingDotFeatures : public CStreamingFeatures
{

public:
    CStreamingDotFeatures();

    CStreamingDotFeatures(CStreamingFile* file, bool is_labelled, int32_t size);

    CStreamingDotFeatures(CDotFeatures* dot_features, float64_t* lab=NULL);

    virtual ~CStreamingDotFeatures();

    virtual float32_t dot(CStreamingDotFeatures* df)=0;

    virtual float32_t dense_dot(const float32_t* vec2, int32_t vec2_len)=0;

    virtual void dense_dot_range(float32_t* output, float32_t* alphas,
            float32_t* vec, int32_t dim, float32_t b, int32_t num_vec=0);

    virtual void add_to_dense_vec(float32_t alpha, float32_t* vec2,
            int32_t vec2_len, bool abs_val=false)=0;

    virtual void expand_if_required(float32_t*& vec, int32_t &len);

    virtual void expand_if_required(float64_t*& vec, int32_t &len);

    virtual int32_t get_dim_feature_space() const=0;

    virtual void* get_feature_iterator();

    virtual int32_t get_nnz_features_for_vector();

    virtual bool get_next_feature(int32_t& index, float32_t& value, void* iterator);

    virtual void free_feature_iterator(void* iterator);

protected:

    float32_t combined_weight;
};
}
#endif // _STREAMING_DOTFEATURES__H__