/// <summary>
/// MNIST のラベルファイルをロードする.
/// 失敗した時は null を返す.
/// </summary>
/// <param name="path">ラベルファイルのパス.</param>
/// <returns></returns>
public static MnistLabelLoader Load(string path)
{
// ファイルが存在しない
if (File.Exists(path) == false)
{
return(null);
}
MnistLabelLoader loader = new MnistLabelLoader();
using (FileStream inStream = new FileStream(path, FileMode.Open, FileAccess.Read))
using (GZipStream decompStream = new GZipStream(inStream, CompressionMode.Decompress))
{
// バイト配列を分解する
BinaryReaderBE reader = new BinaryReaderBE(decompStream);
loader.magicNumber = reader.ReadInt32();
loader.numberOfItems = reader.ReadInt32();
loader.labelList = reader.ReadBytes(loader.numberOfItems);
reader.Close();
}
return(loader);
}
///<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);
}