/// <summary>
/// Conv2s the backward input frame.
/// </summary>
/// <param name="gradOutput">The grad output.</param>
/// <param name="gradInput">The grad input.</param>
/// <param name="weight">The weight.</param>
/// <param name="fgradInput">The fgrad input.</param>
/// <param name="cd">The cd.</param>
private static void Conv2BackwardInputFrame(NDArray gradOutput, NDArray gradInput, NDArray weight, NDArray fgradInput, ConvolutionDesc2d cd)
{
using (var gradOutput2d = gradOutput.View(gradOutput.Shape[0], gradOutput.Shape[1] * gradOutput.Shape[2]))
{
Ops.Addmm(fgradInput, 0, fgradInput, 1, weight, gradOutput2d);
}
Ops.Fill(gradInput, 0);
IntPtr fgradInputPtr, gradInputPtr;
using (NativeWrapper.BuildTensorRefPtr(fgradInput, out fgradInputPtr))
using (NativeWrapper.BuildTensorRefPtr(gradInput, out gradInputPtr))
{
CpuOpsNative.TS_Unfolded_Acc(fgradInputPtr, gradInputPtr, cd.kW, cd.kH, cd.dW, cd.dH, cd.padW, cd.padH,
(int)gradInput.Shape[0], (int)gradInput.Shape[2], (int)gradInput.Shape[1],
(int)gradOutput.Shape[2], (int)gradOutput.Shape[1]);
}
}
