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Update preview.c

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augustin64 2022-04-26 16:44:45 +02:00
parent cad730cb1e
commit 5414699aa8
1 changed files with 15 additions and 86 deletions
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101
src/mnist/preview.c
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@ -3,114 +3,43 @@
#include <stdint.h>
#include <inttypes.h>
uint32_t swap_endian(uint32_t val) {
val = ((val << 8) & 0xFF00FF00) | ((val >> 8) & 0xFF00FF);
return (val << 16) | (val >> 16);
}
#include "mnist.c"
// Prévisualise un chiffre écrit à la main
// de taille width x height
// commencant à l'adresse mémoire start
// dans le fichier pointé par ptr
void print_image(unsigned int width, unsigned int height, FILE* ptr, int start) {
unsigned char buffer[width*height];
fread(buffer, sizeof(buffer), 1, ptr);
int cur;
void print_image(unsigned int width, unsigned int height, int** image) {
char tab[] = {' ', '.', ':', '%', '#', '\0'};
for (int i=0; i<height; i++) {
for (int j=0; j<width; j++) {
cur = (int)buffer[j+i*width];
printf("%c", tab[cur/52]);
for (int i=0; i < height; i++) {
for (int j=0; j < width; j++) {
printf("%c", tab[image[i][j]/52]);
}
printf("\n");
}
}
// Lit un set de données images de la base de données MNIST
// dans le fichier situé à filename, les
// images comportant comme labels 'labels'
void read_mnist_images(char* filename, unsigned int* labels) {
FILE *ptr;
void preview_images(char* images_file, char* labels_file) {
int* parameters = read_mnist_images_parameters(images_file);
ptr = fopen(filename, "rb");
uint32_t magic_number;
uint32_t number_of_images;
unsigned int height;
unsigned int width;
fread(&magic_number, sizeof(uint32_t), 1, ptr);
magic_number = swap_endian(magic_number);
if (magic_number != 2051) {
printf("Incorrect magic number !\n");
exit(1);
}
fread(&number_of_images, sizeof(uint32_t), 1, ptr);
number_of_images = swap_endian(number_of_images);
fread(&height, sizeof(unsigned int), 1, ptr);
height = swap_endian(height);
fread(&width, sizeof(unsigned int), 1, ptr);
width = swap_endian(width);
//printf("magic number: %" PRIu32 "\n", magic_number);
//printf("number of images: %" PRIu32 "\n", number_of_images);
//printf("%u x %u\n\n", width, height);
int number_of_images = parameters[0];
int width = parameters[1];
int height = parameters[2];
unsigned int* labels = read_mnist_labels(labels_file);
int*** images = read_mnist_images(images_file);
for (int i=0; i < number_of_images; i++) {
printf("--- Number %d : %d ---\n", i, labels[i]);
print_image(width, height, ptr, (i*width*height));
print_image(width, height, images[i]);
}
}
unsigned int* read_mnist_labels(char* filename) {
FILE* ptr;
ptr = fopen(filename, "rb");
uint32_t magic_number;
uint32_t number_of_items;
fread(&magic_number, sizeof(uint32_t), 1, ptr);
magic_number = swap_endian(magic_number);
if (magic_number != 2049) {
printf("Incorrect magic number !\n");
exit(1);
}
fread(&number_of_items, sizeof(uint32_t), 1, ptr);
number_of_items = swap_endian(number_of_items);
printf("number of items: %" PRIu32 "\n", number_of_items);
unsigned char buffer[number_of_items];
fread(buffer, sizeof(unsigned char), number_of_items, ptr);
unsigned int* labels = malloc(sizeof(unsigned int)*number_of_items);
for (int i=0; i< number_of_items; i++) {
labels[i] = (unsigned int)buffer[i];
}
return labels;
}
int main(int argc, char *argv[]) {
if (argc < 3) {
printf("Utilisation: %s [IMAGES FILE] [LABELS FILE]\n", argv[0]);
return 1;
}
unsigned int* labels = read_mnist_labels(argv[2]);
read_mnist_images(argv[1], labels);
free(labels);
preview_images(argv[1], argv[2]);
return 0;
}