///<summary>
///Load MNIST data.
///If it fails, it returns null.
///</summary>
///<param name = "path"> Image data path. </param>
///<returns> </returns>
public static MnistImageLoader Load(string path)
{
//File does not exist
if (File.Exists(path) == false)
{
return(null);
}
MnistImageLoader loader = new MnistImageLoader();
//Decompose byte array
using (FileStream inStream = new FileStream(path, FileMode.Open, FileAccess.Read))
using (GZipStream decompStream = new GZipStream(inStream, CompressionMode.Decompress))
{
BinaryReaderBE reader = new BinaryReaderBE(decompStream);
loader.magicNumber = reader.ReadInt32();
loader.numberOfImages = reader.ReadInt32();
loader.numberOfRows = reader.ReadInt32();
loader.numberOfColumns = reader.ReadInt32();
int pixelCount = loader.numberOfRows * loader.numberOfColumns;
for (int i = 0; i < loader.numberOfImages; i++)
{
byte[] pixels = reader.ReadBytes(pixelCount);
loader.bitmapList.Add(pixels);
}
reader.Close();
}
return(loader);
}
public MnistDataLoader()
{
string trainlabelPath = InternetFileDownloader.Donwload(DOWNLOAD_URL + TRAIN_LABEL, TRAIN_LABEL, TRAIN_LABEL_HASH);
MnistLabelLoader trainLabelLoader = MnistLabelLoader.Load(trainlabelPath);
this.TrainLabel = trainLabelLoader.labelList;
string trainimagePath = InternetFileDownloader.Donwload(DOWNLOAD_URL + TRAIN_IMAGE, TRAIN_IMAGE, TRAIN_IMAGE_HASH);
MnistImageLoader trainImageLoader = MnistImageLoader.Load(trainimagePath);
this.TrainData = trainImageLoader.bitmapList.ToArray();
string teachlabelPath = InternetFileDownloader.Donwload(DOWNLOAD_URL + TEACH_LABEL, TEACH_LABEL, TEACH_LABEL_HASH);
MnistLabelLoader teachLabelLoader = MnistLabelLoader.Load(teachlabelPath);
this.TeachLabel = teachLabelLoader.labelList;
string teachimagePath = InternetFileDownloader.Donwload(DOWNLOAD_URL + TEACH_IMAGE, TEACH_IMAGE, TEACH_IMAGE_HASH);
MnistImageLoader teachImageLoader = MnistImageLoader.Load(teachimagePath);
this.TeachData = teachImageLoader.bitmapList.ToArray();
}
