CustomKernel.cpp

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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
 */

#include "lib/common.h"
#include "kernel/CustomKernel.h"
#include "features/Features.h"
#include "features/DummyFeatures.h"
#include "lib/io.h"

using namespace shogun;

CCustomKernel::CCustomKernel()
: CKernel(10), kmatrix(NULL), num_rows(0), num_cols(0), upper_diagonal(false)
{
}

CCustomKernel::CCustomKernel(CKernel* k)
: CKernel(10), kmatrix(NULL), num_rows(0), num_cols(0), upper_diagonal(false)
{
    if (k->lhs_equals_rhs())
    {
        int32_t cols=k->get_num_vec_lhs();
        SG_DEBUG( "using custom kernel of size %dx%d\n", cols,cols);

        kmatrix= new float32_t[int64_t(cols)*(cols+1)/2];

        upper_diagonal=true;
        num_rows=cols;
        num_cols=cols;

        for (int32_t row=0; row<num_rows; row++)
        {
            for (int32_t col=row; col<num_cols; col++)
                kmatrix[int64_t(row) * num_cols - int64_t(row)*(row+1)/2 + col]=k->kernel(row,col);
        }
    }
    else
    {
        int32_t rows=k->get_num_vec_lhs();
        int32_t cols=k->get_num_vec_rhs();
        kmatrix= new float32_t[int64_t(rows)*cols];

        upper_diagonal=false;
        num_rows=rows;
        num_cols=cols;

        for (int32_t row=0; row<num_rows; row++)
        {
            for (int32_t col=0; col<num_cols; col++)
                kmatrix[int64_t(row) * num_cols + col]=k->kernel(row,col);
        }
    }

    dummy_init(num_rows, num_cols);

}

CCustomKernel::CCustomKernel(const float64_t* km, int32_t rows, int32_t cols)
: CKernel(10), kmatrix(NULL), num_rows(0), num_cols(0), upper_diagonal(false)
{
    set_full_kernel_matrix_from_full(km, rows, cols);
}

CCustomKernel::CCustomKernel(const float32_t* km, int32_t rows, int32_t cols)
: CKernel(10), kmatrix(NULL), num_rows(0), num_cols(0), upper_diagonal(false)
{
    set_full_kernel_matrix_from_full(km, rows, cols);
}

CCustomKernel::~CCustomKernel()
{
    cleanup();
}

bool CCustomKernel::dummy_init(int32_t rows, int32_t cols)
{
    return init(new CDummyFeatures(rows), new CDummyFeatures(cols));
}

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

    SG_DEBUG( "num_vec_lhs: %d vs num_rows %d\n", l->get_num_vectors(), num_rows);
    SG_DEBUG( "num_vec_rhs: %d vs num_cols %d\n", r->get_num_vectors(), num_cols);
    ASSERT(l->get_num_vectors()==num_rows);
    ASSERT(r->get_num_vectors()==num_cols);
    return init_normalizer();
}

void CCustomKernel::cleanup_custom()
{
    SG_DEBUG("cleanup up custom kernel\n");
    delete[] kmatrix;
    kmatrix=NULL;
    upper_diagonal=false;
    num_cols=0;
    num_rows=0;
}

void CCustomKernel::cleanup()
{
    cleanup_custom();
    CKernel::cleanup();
}