File size: 5,396 Bytes
9375c9a |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 |
// Copyright (C) 2015 Davis E. King ([email protected])
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_MNIST_CPp_
#define DLIB_MNIST_CPp_
#include "mnist.h"
#include <fstream>
#include "../byte_orderer.h"
#include "../uintn.h"
// ----------------------------------------------------------------------------------------
namespace dlib
{
void load_mnist_dataset (
const std::string& folder_name,
std::vector<matrix<unsigned char> >& training_images,
std::vector<unsigned long>& training_labels,
std::vector<matrix<unsigned char> >& testing_images,
std::vector<unsigned long>& testing_labels
)
{
using namespace std;
ifstream fin1((folder_name+"/train-images-idx3-ubyte").c_str(), ios::binary);
if (!fin1)
{
fin1.open((folder_name + "/train-images.idx3-ubyte").c_str(), ios::binary);
}
ifstream fin2((folder_name+"/train-labels-idx1-ubyte").c_str(), ios::binary);
if (!fin2)
{
fin2.open((folder_name + "/train-labels.idx1-ubyte").c_str(), ios::binary);
}
ifstream fin3((folder_name+"/t10k-images-idx3-ubyte").c_str(), ios::binary);
if (!fin3)
{
fin3.open((folder_name + "/t10k-images.idx3-ubyte").c_str(), ios::binary);
}
ifstream fin4((folder_name+"/t10k-labels-idx1-ubyte").c_str(), ios::binary);
if (!fin4)
{
fin4.open((folder_name + "/t10k-labels.idx1-ubyte").c_str(), ios::binary);
}
if (!fin1) throw error("Unable to open file train-images-idx3-ubyte or train-images.idx3-ubyte");
if (!fin2) throw error("Unable to open file train-labels-idx1-ubyte or train-labels.idx1-ubyte");
if (!fin3) throw error("Unable to open file t10k-images-idx3-ubyte or t10k-images.idx3-ubyte");
if (!fin4) throw error("Unable to open file t10k-labels-idx1-ubyte or t10k-labels.idx1-ubyte");
byte_orderer bo;
// make sure the files have the contents we expect.
uint32 magic, num, nr, nc, num2, num3, num4;
fin1.read((char*)&magic, sizeof(magic)); bo.big_to_host(magic);
fin1.read((char*)&num, sizeof(num)); bo.big_to_host(num);
fin1.read((char*)&nr, sizeof(nr)); bo.big_to_host(nr);
fin1.read((char*)&nc, sizeof(nc)); bo.big_to_host(nc);
if (magic != 2051 || num != 60000 || nr != 28 || nc != 28)
throw error("mnist dat files are corrupted.");
fin2.read((char*)&magic, sizeof(magic)); bo.big_to_host(magic);
fin2.read((char*)&num2, sizeof(num2)); bo.big_to_host(num2);
if (magic != 2049 || num2 != 60000)
throw error("mnist dat files are corrupted.");
fin3.read((char*)&magic, sizeof(magic)); bo.big_to_host(magic);
fin3.read((char*)&num3, sizeof(num3)); bo.big_to_host(num3);
fin3.read((char*)&nr, sizeof(nr)); bo.big_to_host(nr);
fin3.read((char*)&nc, sizeof(nc)); bo.big_to_host(nc);
if (magic != 2051 || num3 != 10000 || nr != 28 || nc != 28)
throw error("mnist dat files are corrupted.");
fin4.read((char*)&magic, sizeof(magic)); bo.big_to_host(magic);
fin4.read((char*)&num4, sizeof(num4)); bo.big_to_host(num4);
if (magic != 2049 || num4 != 10000)
throw error("mnist dat files are corrupted.");
if (!fin1) throw error("Unable to read train-images-idx3-ubyte");
if (!fin2) throw error("Unable to read train-labels-idx1-ubyte");
if (!fin3) throw error("Unable to read t10k-images-idx3-ubyte");
if (!fin4) throw error("Unable to read t10k-labels-idx1-ubyte");
training_images.resize(60000);
training_labels.resize(60000);
testing_images.resize(10000);
testing_labels.resize(10000);
for (size_t i = 0; i < training_images.size(); ++i)
{
training_images[i].set_size(nr,nc);
fin1.read((char*)&training_images[i](0,0), nr*nc);
}
for (size_t i = 0; i < training_labels.size(); ++i)
{
char l;
fin2.read(&l, 1);
training_labels[i] = l;
}
for (size_t i = 0; i < testing_images.size(); ++i)
{
testing_images[i].set_size(nr,nc);
fin3.read((char*)&testing_images[i](0,0), nr*nc);
}
for (size_t i = 0; i < testing_labels.size(); ++i)
{
char l;
fin4.read(&l, 1);
testing_labels[i] = l;
}
if (!fin1) throw error("Unable to read train-images-idx3-ubyte");
if (!fin2) throw error("Unable to read train-labels-idx1-ubyte");
if (!fin3) throw error("Unable to read t10k-images-idx3-ubyte");
if (!fin4) throw error("Unable to read t10k-labels-idx1-ubyte");
if (fin1.get() != EOF) throw error("Unexpected bytes at end of train-images-idx3-ubyte");
if (fin2.get() != EOF) throw error("Unexpected bytes at end of train-labels-idx1-ubyte");
if (fin3.get() != EOF) throw error("Unexpected bytes at end of t10k-images-idx3-ubyte");
if (fin4.get() != EOF) throw error("Unexpected bytes at end of t10k-labels-idx1-ubyte");
}
}
// ----------------------------------------------------------------------------------------
#endif // DLIB_MNIST_CPp_
|