static void testRandomImage()
{
MNISTImage image = new MNISTImage();
byte[] bytes = new byte[28 * 28];
random.NextBytes(bytes);
for (int m = 0; m < 28; m++)
{
for (int n = 0; n < 28; n++)
{
image[m, n] = bytes[28 * m + n];
}
}
Console.WriteLine("MNIST image:");
Console.WriteLine(image.ToString());
Console.ReadLine();
}
private List <MNISTImage> loadImagesfile(String imagesFileName, int correctSize, String correctHeaderSignature)
{
if (imagesFileName == null)
{
throw new Exception("MNIST: imagesFileName is null.");
}
List <MNISTImage> images = new List <MNISTImage>();
byte[] bytes = File.ReadAllBytes(imagesFileName);
int totalSize = bytes.Length;
if (totalSize != correctSize)
{
throw new Exception("MNIST: imagesFile has incorrect size." +
" Number of bytes is " + totalSize.ToString());
}
String headerSignature =
bytes[0].ToString() + ", " +
bytes[1].ToString() + ", " +
bytes[2].ToString() + ", " +
bytes[3].ToString() + " | " +
bytes[4].ToString() + ", " +
bytes[5].ToString() + ", " +
bytes[6].ToString() + ", " +
bytes[7].ToString() + " | " +
bytes[8].ToString() + ", " +
bytes[9].ToString() + ", " +
bytes[10].ToString() + ", " +
bytes[11].ToString() + " | " +
bytes[12].ToString() + ", " +
bytes[13].ToString() + ", " +
bytes[14].ToString() + ", " +
bytes[15].ToString();
if (headerSignature != correctHeaderSignature)
{
throw new Exception("MNIST: imagesFile has incorrect header signature." +
" Header signature is " + headerSignature);
}
int headerSize = 4 + 4 + 4 + 4;
int nrOfRows = 28;
int rowSize = 28;
int imageSize = nrOfRows * rowSize;
int nrOfImages = (totalSize - headerSize) / imageSize;
int i0 = headerSize;
MNISTImage mnistImage = null;
for (int k = 0; k < nrOfImages; k++)
{
mnistImage = new MNISTImage();
for (int m = 0; m < nrOfRows; m++)
{
for (int n = 0; n < rowSize; n++)
{
mnistImage[m, n] = bytes[i0 + (k * imageSize) + ((m * rowSize) + n)];
}
}
images.Add(mnistImage);
}
return(images);
}
