SparseEuclidianDistance.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) 2007-2009 Soeren Sonnenburg
 * Copyright (C) 2007-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _SPARSEEUCLIDIANDISTANCE_H__
#define _SPARSEEUCLIDIANDISTANCE_H__

#include <shogun/lib/common.h>
#include <shogun/distance/SparseDistance.h>
#include <shogun/features/SparseFeatures.h>

namespace shogun
{
    template <class T> class CSparseFeatures;
class CSparseEuclidianDistance: public CSparseDistance<float64_t>
{
    public:
        CSparseEuclidianDistance();

        CSparseEuclidianDistance(
            CSparseFeatures<float64_t>* l, CSparseFeatures<float64_t>* r);
        virtual ~CSparseEuclidianDistance();

        virtual bool init(CFeatures* l, CFeatures* r);

        virtual void cleanup();

        virtual EDistanceType get_distance_type() { return D_SPARSEEUCLIDIAN; }

        inline virtual EFeatureType get_feature_type() { return F_DREAL; }

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

    protected:
        virtual float64_t compute(int32_t idx_a, int32_t idx_b);
        /*    compute_kernel*/

    private:
        void init();

    protected:
        float64_t* sq_lhs;
        float64_t* sq_rhs;

};

} // namespace shogun
#endif /* _SPARSEEUCLIDIANDISTANCE_H__ */