CrossValidationMKLStorage.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) 2012 Sergey Lisitsyn
 * Written (W) 2012 Heiko Strathmann
 */

#include <shogun/evaluation/CrossValidationMKLStorage.h>
#include <shogun/kernel/CombinedKernel.h>
#include <shogun/classifier/mkl/MKL.h>
#include <shogun/classifier/mkl/MKLMulticlass.h>

using namespace shogun;

void CCrossValidationMKLStorage::update_trained_machine(
        CMachine* machine, const char* prefix)
{
    REQUIRE(machine, "%s::update_trained_machine(): Provided Machine is NULL!\n",
            get_name());

    CMKL* mkl=dynamic_cast<CMKL*>(machine);
    CMKLMulticlass* mkl_multiclass=dynamic_cast<CMKLMulticlass*>(machine);
    REQUIRE(mkl || mkl_multiclass, "%s::update_trained_machine(): This method is only usable "
                "with CMKL derived machines. This one is \"%s\"\n", get_name(),
                machine->get_name());

    CKernel* kernel = NULL;
    if (mkl)
        kernel = mkl->get_kernel();
    else
        kernel = mkl_multiclass->get_kernel();

    REQUIRE(kernel, "%s::update_trained_machine(): No kernel assigned to "
            "machine of type \"%s\"\n", get_name(), machine->get_name());

    CCombinedKernel* combined_kernel=dynamic_cast<CCombinedKernel*>(kernel);
    REQUIRE(combined_kernel, "%s::update_trained_machine(): This method is only"
            " usable with CCombinedKernel on machines. This one is \"s\"\n",
            get_name(), kernel->get_name());

    SGVector<float64_t> w=combined_kernel->get_subkernel_weights();

    /* evtl re-allocate memory (different number of runs from evaluation before) */
    if (m_mkl_weights.num_rows!=w.vlen ||
            m_mkl_weights.num_cols!=m_num_folds*m_num_runs)
    {
        if (m_mkl_weights.matrix)
        {
            SG_DEBUG("deleting memory for mkl weight matrix\n")
            m_mkl_weights=SGMatrix<float64_t>();
        }
    }

    /* evtl allocate memory (first call) */
    if (!m_mkl_weights.matrix)
    {
        SG_DEBUG("allocating memory for mkl weight matrix\n")
        m_mkl_weights=SGMatrix<float64_t>(w.vlen,m_num_folds*m_num_runs);
    }

    /* put current mkl weights into matrix, copy memory vector wise to make
     * things fast. Compute index of address to where vector goes */

    /* number of runs is w.vlen*m_num_folds shift */
    index_t run_shift=m_current_run_index*w.vlen*m_num_folds;

    /* fold shift is m_current_fold_index*w-vlen */
    index_t fold_shift=m_current_fold_index*w.vlen;

    /* add both index shifts */
    index_t first_idx=run_shift+fold_shift;
    SG_DEBUG("run %d, fold %d, matrix index %d\n",m_current_run_index,
            m_current_fold_index, first_idx);

    /* copy memory */
    memcpy(&m_mkl_weights.matrix[first_idx], w.vector,
            w.vlen*sizeof(float64_t));

    SG_UNREF(kernel);
}