LocallyLinearEmbedding.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 Sergey Lisitsyn
 * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
 */

#ifndef LOCALLYLINEAREMBEDDING_H_
#define LOCALLYLINEAREMBEDDING_H_
#include <shogun/lib/config.h>
#ifdef HAVE_LAPACK
#include <shogun/preprocessor/DimensionReductionPreprocessor.h>
#include <shogun/features/Features.h>
#include <shogun/distance/Distance.h>

namespace shogun
{

class CFeatures;

class CDistance;

class CLocallyLinearEmbedding: public CDimensionReductionPreprocessor
{
public:

    CLocallyLinearEmbedding();

    virtual ~CLocallyLinearEmbedding();

    virtual bool init(CFeatures* features);

    virtual void cleanup();

    virtual SGMatrix<float64_t> apply_to_feature_matrix(CFeatures* features);

    virtual SGVector<float64_t> apply_to_feature_vector(SGVector<float64_t> vector);

    void inline set_k(int32_t k)
    {
        m_k = k;
    }

    int32_t inline get_k()
    {
        return m_k;
    }

    void inline set_posdef(bool posdef)
    {
        m_posdef = posdef;
    }

    bool inline get_posdef()
    {
        return m_posdef;
    }

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

    virtual inline EPreprocessorType get_type() const { return P_LOCALLYLINEAREMBEDDING; };

protected:

    void init();

    static void* run_neighborhood_thread(void* p);

    static void* run_linearreconstruction_thread(void* p);

    SGMatrix<float64_t> find_null_space(SGMatrix<float64_t> matrix, int dimension, bool force_lapack);

    SGMatrix<int32_t> get_neighborhood_matrix(CDistance* distance);

protected:

    int32_t m_k;

    bool m_posdef;

};
}

#endif /* HAVE_LAPACK */
#endif /* LOCALLYLINEAREMBEDDING_H_ */