StochasticProximityEmbedding.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) 2012 Fernando José Iglesias García
 * Copyright (C) 2012 Fernando José Iglesias García
 */

#ifndef STOCHASTICPROXIMITYEMBEDDING_H_
#define STOCHASTICPROXIMITYEMBEDDING_H_
#include <shogun/lib/config.h>
#ifdef HAVE_LAPACK
#include <shogun/converter/EmbeddingConverter.h>
#include <shogun/features/Features.h>
#include <shogun/distance/Distance.h>

namespace shogun
{

enum ESPEStrategy
{
    SPE_GLOBAL,
    SPE_LOCAL,
};

class CStochasticProximityEmbedding : public CEmbeddingConverter
{

    public:

        CStochasticProximityEmbedding();

        virtual ~CStochasticProximityEmbedding();

        virtual CFeatures* apply(CFeatures* features);

        void set_k(int32_t k);

        int32_t get_k() const;

        void set_strategy(ESPEStrategy strategy);

        ESPEStrategy get_strategy() const;

        void set_tolerance(float32_t tolerance);

        int32_t get_tolerance() const;

        void set_nupdates(int32_t nupdates);

        int32_t get_nupdates() const;

        virtual const char* get_name() const;

    private:

        void init();

        virtual SGMatrix<int32_t> get_neighborhood_matrix(CDistance* distance, int32_t k, int32_t N, float64_t max_dist);

        virtual CDenseFeatures< float64_t >* embed_distance(CDistance* distance);

    private:

        ESPEStrategy m_strategy;

        int32_t m_k;

        float32_t m_tolerance;

        int32_t m_nupdates;

};

} /* namespace shogun */


#endif /* HAVE_LAPACK */
#endif /* STOCHASTICPROXIMITYEMBEDDING_H_ */