SparseKernel.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) 1999-2009 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _SPARSEKERNEL_H___
#define _SPARSEKERNEL_H___

#include <shogun/lib/config.h>

#include <shogun/kernel/Kernel.h>
#include <shogun/features/SparseFeatures.h>

namespace shogun
{
template <class ST> class CSparseKernel : public CKernel
{
    public:
        CSparseKernel(int32_t cachesize) : CKernel(cachesize) {}

        CSparseKernel(CFeatures* l, CFeatures* r) : CKernel(10)
        {
            init(l, r);
        }

        virtual bool init(CFeatures* l, CFeatures* r)
        {
            CKernel::init(l,r);

            ASSERT(l->get_feature_class()==C_SPARSE)
            ASSERT(r->get_feature_class()==C_SPARSE)
            ASSERT(l->get_feature_type()==this->get_feature_type())
            ASSERT(r->get_feature_type()==this->get_feature_type())

            if (((CSparseFeatures<ST>*) lhs)->get_num_features() != ((CSparseFeatures<ST>*) rhs)->get_num_features())
            {
                SG_ERROR("train or test features #dimension mismatch (l:%d vs. r:%d)\n",
                        ((CSparseFeatures<ST>*) lhs)->get_num_features(),((CSparseFeatures<ST>*)rhs)->get_num_features());
            }
            return true;
        }

        virtual EFeatureClass get_feature_class() { return C_SPARSE; }

        virtual EFeatureType get_feature_type();

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

        virtual EKernelType get_kernel_type()=0;
};

template<> inline EFeatureType CSparseKernel<float64_t>::get_feature_type() { return F_DREAL; }

template<> inline EFeatureType CSparseKernel<uint64_t>::get_feature_type() { return F_ULONG; }

template<> inline EFeatureType CSparseKernel<int32_t>::get_feature_type() { return F_INT; }

template<> inline EFeatureType CSparseKernel<uint16_t>::get_feature_type() { return F_WORD; }

template<> inline EFeatureType CSparseKernel<int16_t>::get_feature_type() { return F_SHORT; }

template<> inline EFeatureType CSparseKernel<uint8_t>::get_feature_type() { return F_BYTE; }

template<> inline EFeatureType CSparseKernel<char>::get_feature_type() { return F_CHAR; }
}
#endif /* _SPARSEKERNEL_H__ */