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/**
* @file gensvm_sv.c
* @author Gertjan van den Burg
* @date May, 2014
* @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.
*
*/
#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
* @param[in] data GenData to be used
* @return number of support vectors with this solution
*
*/
long gensvm_num_sv(struct GenModel *model, struct GenData *data)
{
long i, j, num_correct, num_sv = 0;
double value;
for (i=0; i<data->n; i++) {
num_correct = 0;
for (j=0; j<data->K; j++) {
value = matrix_get(model->Q, data->K, i, j);
num_correct += (value > 1);
}
num_sv += (num_correct < data->K - 1);
}
return num_sv;
}
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