StreamingDenseFeatures.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
 * Written (W) 2012 Heiko Strathmann
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
 */
#ifndef _STREAMINGDENSEFEATURES__H__
#define _STREAMINGDENSEFEATURES__H__

#include <shogun/lib/config.h>

#include <shogun/lib/common.h>
#include <shogun/features/streaming/StreamingDotFeatures.h>
#include <shogun/features/DenseFeatures.h>
#include <shogun/lib/DataType.h>
#include <shogun/io/streaming/InputParser.h>

namespace shogun
{
template<class T> class CStreamingDenseFeatures:
    public CStreamingDotFeatures
{
public:

    CStreamingDenseFeatures();

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

    CStreamingDenseFeatures(CDenseFeatures<T>* dense_features, float64_t* lab=
            NULL);

    ~CStreamingDenseFeatures();

    virtual void set_vector_reader();

    virtual void set_vector_and_label_reader();

    virtual void start_parser();

    virtual void end_parser();

    virtual void reset_stream();

    virtual bool get_next_example();

    SGVector<T> get_vector();

    virtual float64_t get_label();

    virtual void release_example();

    virtual int32_t get_dim_feature_space() const;

    virtual float32_t dot(SGVector<T> vec);

    virtual float32_t dot(CStreamingDotFeatures *df);

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

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

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

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

    virtual int32_t get_nnz_features_for_vector();

    int32_t get_num_features();

    virtual EFeatureType get_feature_type() const;

    virtual EFeatureClass get_feature_class() const;

    virtual CFeatures* duplicate() const;

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

    virtual int32_t get_num_vectors() const;

    virtual CFeatures* get_streamed_features(index_t num_elements);

private:
    void init();

    void init(CStreamingFile *file, bool is_labelled, int32_t size);

protected:

    float32_t combined_weight;

    CInputParser<T> parser;

    SGVector<T> current_vector;

    float64_t current_label;
};
}
#endif // _STREAMINGDENSEFEATURES__H__