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Merge branch 'master' of github.com:emjotde/Marian

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This commit is contained in:
Hieu Hoang 2016-09-13 18:57:35 +02:00
commit e354ea7570
1 changed files with 15 additions and 16 deletions
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31
src/mnist.h
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@ -1,4 +1,4 @@
#pragma once
//#pragma once
#include <string>
#include <iostream>
@ -16,7 +16,7 @@ auto reverseInt = [](int i) {
return ((int)c1 << 24) + ((int)c2 << 16) + ((int)c3 << 8) + c4;
};
std::vector<std::vector<float>> ReadImages(const std::string& full_path) {
std::vector<float> ReadImages(const std::string& full_path, int& number_of_images, int& image_size) {
std::ifstream file(full_path);
if (! file.is_open())
@ -30,20 +30,18 @@ std::vector<std::vector<float>> ReadImages(const std::string& full_path) {
if (magic_number != 2051)
throw std::runtime_error("Invalid MNIST image file!");
int number_of_images = 0;
file.read((char *)&number_of_images, sizeof(number_of_images)), number_of_images = reverseInt(number_of_images);
file.read((char *)&n_rows, sizeof(n_rows)), n_rows = reverseInt(n_rows);
file.read((char *)&n_cols, sizeof(n_cols)), n_cols = reverseInt(n_cols);
int image_size = n_rows * n_cols;
std::vector<std::vector<float>> _dataset(number_of_images, std::vector<float>(image_size));
image_size = n_rows * n_cols;
int n = number_of_images * image_size;
std::vector<float> _dataset(n);
unsigned char pixel = 0;
for (int i = 0; i < number_of_images; i++) {
for (int j = 0; j < image_size; j++) {
file.read((char*)&pixel, sizeof(pixel));
_dataset[i][j] = pixel / 255.0f;
}
for (int i = 0; i < n; i++) {
file.read((char*)&pixel, sizeof(pixel));
_dataset[i] = pixel / 255.0f;
}
return _dataset;
}
@ -77,16 +75,17 @@ std::vector<int> ReadLabels(const std::string& full_path) {
//int main(int argc, const char *argv[]) {
//auto images = datasets::mnist::ReadImages("t10k-images-idx3-ubyte");
//auto labels = datasets::mnist::ReadLabels("t10k-labels-idx1-ubyte");
//int numImg, imgSize;
//auto images = datasets::mnist::ReadImages("../examples/mnist/t10k-images-idx3-ubyte", numImg, imgSize);
//auto labels = datasets::mnist::ReadLabels("../examples/mnist/t10k-labels-idx1-ubyte");
//std::cout
//<< "Number of images: " << images.size() << std::endl
//<< "Image size: " << images[0].size() << std::endl;
//<< "Number of images: " << numImg << std::endl
//<< "Image size: " << imgSize << std::endl;
//for (int i = 0; i < 3; i++) {
//for (int j = 0; j < images[i].size(); j++) {
//std::cout << images[i][j] << ",";
//for (int j = 0; j < imgSize; j++) {
//std::cout << images[(i * imgSize) + j] << ",";
//}
//std::cout << " label=" << (int)labels[i] << std::endl;
//}