LaplacianEigenmaps.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 LAPLACIANEIGENMAPS_H_
#define LAPLACIANEIGENMAPS_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
{

class CFeatures;
class CDistance;

class CLaplacianEigenmaps: public CEmbeddingConverter
{
public:

    CLaplacianEigenmaps();

    virtual ~CLaplacianEigenmaps();

    virtual CFeatures* apply(CFeatures* features);

    virtual CSimpleFeatures<float64_t>* embed_distance(CDistance* distance, CFeatures* features=NULL);

    void set_k(int32_t k);

    int32_t get_k() const;

    void set_tau(float64_t tau);
    
    float64_t get_tau() const;

    virtual const char* get_name() const;

protected:

    void init();

    virtual CSimpleFeatures<float64_t>* construct_embedding(CFeatures* features, 
                                                            SGMatrix<float64_t> W_matrix);

protected:

    int32_t m_k;

    float64_t m_tau;

};
}

#endif /* HAVE_LAPACK */
#endif /* LAPLACIANEIGENMAPS_H_ */