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makefolds.c
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makefolds.c
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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.
*
* Copyright (C) 2011-2012 Gad Abraham and National ICT Australia (NICTA).
* All rights reserved.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include "common.h"
#include "util.h"
#include "ind.h"
/*
* Split data into training and test set
*/
void split(int *folds, int n, int nfolds)
{
int i;
for(i = 0 ; i < n ; i++)
folds[i] = (int)(drand48() * nfolds);
}
/*
* indicator vector of length nfolds * n, each group of n int represents
* whether the samples in the kth fold are training (1) or testing (0)
*/
void make_ind(int *ind, int *folds, int n, int nfolds)
{
int i, k;
for(k = 0 ; k < nfolds ; k++)
for(i = 0 ; i < n ; i++)
ind[k * n + i] = (folds[i] != k);
}
int main(int argc, char *argv[])
{
long seed = 0;
int ret, i, nfolds = 10, n = 0;
char *file_folds = NULL,
*file_ind = NULL;
int *folds = NULL,
*ind = NULL;
seed = getpid();
printf("makefolds: seed=%ld\n", seed);
for(i = 1 ; i < argc ; i++)
{
if(strcmp2(argv[i], "-n"))
{
i++;
n = (int)atof(argv[i]);
}
else if(strcmp2(argv[i], "-nfolds"))
{
i++;
nfolds = (int)atof(argv[i]);
}
else if(strcmp2(argv[i], "-folds"))
{
i++;
file_folds = argv[i];
}
else if(strcmp2(argv[i], "-ind"))
{
i++;
file_ind = argv[i];
}
else if(strcmp2(argv[i], "-seed"))
{
i++;
seed = atol(argv[i]);
}
}
if(n == 0 || file_folds == NULL)
{
printf("usage: makefolds -folds <filename> -ind <filename> \
-nfolds <#nfolds> -n <#n> [-seed <seed>]\n");
return EXIT_FAILURE;
}
srand48(seed);
MALLOCTEST(folds, sizeof(int) * n);
MALLOCTEST(ind, sizeof(int) * n * nfolds);
split(folds, n, nfolds);
/* write folds file (which fold each sample belongs to) */
if(!writevectorl(file_folds, folds, n))
{
free(folds);
return EXIT_FAILURE;
}
/* write indicator file (in each fold, which samples are training and which
* are testing) */
make_ind(ind, folds, n, nfolds);
ret = ind_write(file_ind, ind, n, nfolds);
free(folds);
free(ind);
return ret && EXIT_SUCCESS;
}