public void ComputeTwiceGradientShouldYieldTheSameResult()
{
const int inputWidth = 10;
const int inputHeight = 10;
const int inputDepth = 2;
const int filterWidth = 3;
const int filterHeight = 3;
const int filterCount = 2;
// Create layer
var layer = new ConvLayer <double>(filterWidth, filterHeight, filterCount)
{
Stride = 2, BiasPref = 0.1
};
layer.Init(inputWidth, inputHeight, inputDepth);
// Forward pass
var input = BuilderInstance <double> .Volume.Random(new Shape(inputWidth, inputHeight, inputDepth));
var output = layer.DoForward(input, true);
// Set output gradients to 1
var outputGradient = BuilderInstance <double> .Volume.From(new double[output.Shape.TotalLength].Populate(1.0), output.Shape);
// Backward pass to retrieve gradients
layer.Backward(outputGradient);
var step1 = ((Volume <double>)layer.InputActivationGradients.Clone()).ToArray();
layer.Backward(outputGradient);
var step2 = ((Volume <double>)layer.InputActivationGradients.Clone()).ToArray();
Assert.IsTrue(step1.SequenceEqual(step2));
}
