public void LabelIndexer_LabelOutOfRange()
{
var testMnistImageLabelIndex = new MnistImageLabelIndex(Enumerable.Empty <MnistImage>());
var e = Assert.Throws <IndexOutOfRangeException>(delegate
{
var result = testMnistImageLabelIndex[-1];
});
Assert.That(e.Message, Does.StartWith("Invalid index -1. Indexer 'label' must be between 0 and 9 inclusive."));
e = Assert.Throws <IndexOutOfRangeException>(delegate
{
var result = testMnistImageLabelIndex[10];
});
Assert.That(e.Message, Does.StartWith("Invalid index 10. Indexer 'label' must be between 0 and 9 inclusive."));
}
/// <summary>
/// Sets up objects storing and indexing MNIST image data, and adds them to the specified services collection.
/// </summary>
/// <param name="services">The services collection to add the objects to.</param>
protected void SetupMnistImageDataStructures(IServiceCollection services)
{
MnistImageStoreOptions options = Configuration.GetSection(mnistImageStoreSettingsKeyName).Get <MnistImageStoreOptions>();
// Read the MNIST data
var mnistImageReader = new MnistImageNativeFormatFileReader(options.MnistImageDataFileUri, options.MnistLabelFileUri);
List <MnistImage> allMnistImages = null;
// This stores the images grouped by label.
MnistImageLabelIndex mnistImagesByLabel = null;
try
{
IEnumerable <MnistImage> allImages = mnistImageReader.Read();
allMnistImages = new List <MnistImage>(allImages);
allImages = mnistImageReader.Read();
mnistImagesByLabel = new MnistImageLabelIndex(allMnistImages);
}
catch (Exception e)
{
throw new Exception("Failed to read MNIST images.", e);
}
services.AddSingleton <List <MnistImage> >(allMnistImages);
services.AddSingleton <MnistImageLabelIndex>(mnistImagesByLabel);
}
/// <summary>
/// Initialises a new instance of the MnistImageStore.Controllers.MnistImageController class.
/// </summary>
/// <param name="allMnistImages">Holds all MNIST images.</param>
/// <param name="mnistImagesByLabel">Holds MNIST images keyed by the image label.</param>
public MnistImageController(List <MnistImage> allMnistImages, MnistImageLabelIndex mnistImagesByLabel)
{
this.allMnistImages = allMnistImages;
this.mnistImagesByLabel = mnistImagesByLabel;
}