public void ConvolveGradientBatch()
{
// 3x3x3x2
var input = new Single.Volume(new float[27 * 2].Populate(1.0f), new Shape(3, 3, 3, 2),
GpuContext.Default);
// 2x2x3x2
var filter = new Single.Volume(
new float[12].Populate(1.0f).Concat(new float[12].Populate(2.0f)).ToArray(),
new Shape(2, 2, 3, 2),
GpuContext.Default);
var outputGradient = new Single.Volume(new[]
{
2.0f, 3.0f,
4.0f, 5.0f
}, new Shape(1, 1, 2, 2),
GpuContext.Default);
var inputGradient = BuilderInstance <float> .Volume.SameAs(input.Storage, input.Shape);
var filterGradient = BuilderInstance <float> .Volume.SameAs(filter.Storage, filter.Shape);
input.ConvolveGradient(filter, outputGradient, inputGradient, filterGradient, 0, 2);
// input gradient
Assert.AreEqual(8.0f, inputGradient.Get(0, 0, 0, 0));
Assert.AreEqual(0f, inputGradient.Get(2, 2, 2, 0));
Assert.AreEqual(0f, inputGradient.Get(2, 2, 1, 0));
Assert.AreEqual(14.0f, inputGradient.Get(0, 0, 0, 1));
Assert.AreEqual(0.0f, inputGradient.Get(2, 2, 2, 1));
Assert.AreEqual(0.0f, inputGradient.Get(2, 2, 1, 1));
// filter gradient
Assert.AreEqual(1.0f, filter.Get(0, 0, 0, 0));
Assert.AreEqual(1.0f, filter.Get(0, 0, 1, 0));
Assert.AreEqual(1.0f, filter.Get(0, 0, 2, 0));
Assert.AreEqual(2.0f, filter.Get(0, 0, 0, 1));
Assert.AreEqual(2.0f, filter.Get(0, 0, 1, 1));
Assert.AreEqual(2.0f, filter.Get(0, 0, 2, 1));
}
