void normalize_array(float *a, int n)
{
int i;
float mu = mean_array(a,n);
float sigma = sqrt(variance_array(a,n));
for(i = 0; i < n; ++i){
a[i] = (a[i] - mu)/sigma;
}
mu = mean_array(a,n);
sigma = sqrt(variance_array(a,n));
}
float variance_array(float *a, int n)
{
int i;
float sum = 0;
float mean = mean_array(a, n);
for(i = 0; i < n; ++i) sum += (a[i] - mean)*(a[i]-mean);
float variance = sum/n;
return variance;
}
void calculate_loss(float *output, float *delta, int n, float thresh)
{
int i;
float mean = mean_array(output, n);
float var = variance_array(output, n);
for(i = 0; i < n; ++i){
if(delta[i] > mean + thresh*sqrt(var)) delta[i] = output[i];
else delta[i] = 0;
}
}
int main (int argc, char* argv[])
{
//create a pointer, which will be used to store the array
int *A;
//check if the user ran the program correctly
if (argc < 2) {
fprintf(stderr, "Usage: mean_median file1 [file2 ...]\n");
}
//if the program is run correctly argv[1] will be the first
//command line argument. ie name of the input file
char *file = argv[1];
//open file for reading
FILE *fp = fopen(file, "rb");
if (fp == NULL)
return 1;
//call read_array function which will allocate space for A
//read the file and put the numbers in array A
//the read_array function must return the size of the array
int n = read_array(fp, &A);
if (n < 0) {
return 1;
}
//print array A of size n
print_array(A, n);
//sort
select_sort(A, n);
//print again
print_array(A, n);
//calculate mean and median of array A
double mean = mean_array(A, n);
double med = median_array(A, n);
//print results
printf("mean = %f med = %f\n", mean, med);
//cleanup
free(A);
fclose(fp);
return 0;
}
void print_network(network net)
{
int i,j;
for(i = 0; i < net.n; ++i){
layer l = net.layers[i];
float *output = l.output;
int n = l.outputs;
float mean = mean_array(output, n);
float vari = variance_array(output, n);
fprintf(stderr, "Layer %d - Mean: %f, Variance: %f\n",i,mean, vari);
if(n > 100) n = 100;
for(j = 0; j < n; ++j) fprintf(stderr, "%f, ", output[j]);
if(n == 100)fprintf(stderr,".....\n");
fprintf(stderr, "\n");
}
}
void print_statistics(float *a, int n)
{
float m = mean_array(a, n);
float v = variance_array(a, n);
printf("MSE: %.6f, Mean: %.6f, Variance: %.6f\n", mse_array(a, n), m, v);
}
