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/**
* @file gensvm_sv.c
* @author G.J.J. van den Burg
* @date 2014-05-01
* @brief Calculate the number of support vectors
*
* @details
* The function in this file can be used to calculate the number of support
* vectors are left in a model.
*
* @copyright
Copyright 2016, G.J.J. van den Burg.
This file is part of GenSVM.
GenSVM 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.
GenSVM is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GenSVM. If not, see <http://www.gnu.org/licenses/>.
*/
#include "gensvm_sv.h"
/**
* @brief Calculate the number of support vectors in a model
*
* @details
* If an object is correctly classified, the number of classes for which the
* error q is larger than 1, is K-1 (i.e., there is no error w.r.t. any of the
* other classes). All objects for which this is not the case are thus support
* vectors.
*
* @param[in] model GenModel with solution and up-to-date Q matrix
* @return number of support vectors with this solution
*
*/
long gensvm_num_sv(struct GenModel *model)
{
long i, j, num_correct, num_sv = 0;
double value;
for (i=0; i<model->n; i++) {
num_correct = 0;
for (j=0; j<model->K; j++) {
value = matrix_get(model->Q, model->K, i, j);
num_correct += (value > 1);
}
num_sv += (num_correct < model->K - 1);
}
return num_sv;
}
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