/// <summary>
/// Encode a MPSCnnKernel into a command Buffer. The operation shall proceed out-of-place.
/// We calculate the appropriate offset as per how TensorFlow calculates its padding using input image size and stride here.
/// This [Link](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/python/ops/nn.py) has an explanation in header comments how tensorFlow pads its convolution input images.
/// </summary>
/// <param name="commandBuffer">A valid MTLCommandBuffer to receive the encoded filter</param>
/// <param name="sourceImage">A valid MPSImage object containing the source image.</param>
/// <param name="destinationImage">A valid MPSImage to be overwritten by result image. destinationImage may not alias sourceImage</param>
public override void EncodeToCommandBuffer(IMTLCommandBuffer commandBuffer, MPSImage sourceImage, MPSImage destinationImage)
{
// select offset according to padding being used or not
if (padding)
{
var pad_along_height = ((destinationImage.Height - 1) * StrideInPixelsY + KernelHeight - sourceImage.Height);
var pad_along_width = ((destinationImage.Width - 1) * StrideInPixelsX + KernelWidth - sourceImage.Width);
var pad_top = pad_along_height / 2;
var pad_left = pad_along_width / 2;
Offset = new MPSOffset {
X = (nint)(KernelWidth / 2 - pad_left),
Y = (nint)(KernelHeight / 2 - pad_top),
Z = 0
};
}
else
{
Offset = new MPSOffset {
X = (nint)(KernelWidth / 2),
Y = (nint)(KernelHeight / 2),
Z = 0
};
}
base.EncodeToCommandBuffer(commandBuffer, sourceImage, destinationImage);
}
/// <summary>
/// Encode a MPSCnnKernel into a command Buffer. The operation shall proceed out-of-place.
/// We calculate the appropriate offset as per how TensorFlow calculates its padding using input image size and stride here.
/// This [Link](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/python/ops/nn.py) has an explanation in header comments how tensorFlow pads its convolution input images.
/// </summary>
/// <param name="commandBuffer">A valid MTLCommandBuffer to receive the encoded filter</param>
/// <param name="sourceImage">A valid MPSImage object containing the source image.</param>
/// <param name="destinationImage">A valid MPSImage to be overwritten by result image. destinationImage may not alias sourceImage</param>
public override void EncodeToCommandBuffer (IMTLCommandBuffer commandBuffer, MPSImage sourceImage, MPSImage destinationImage)
{
// select offset according to padding being used or not
if (padding) {
var pad_along_height = ((destinationImage.Height - 1) * StrideInPixelsY + KernelHeight - sourceImage.Height);
var pad_along_width = ((destinationImage.Width - 1) * StrideInPixelsX + KernelWidth - sourceImage.Width);
var pad_top = pad_along_height / 2;
var pad_left = pad_along_width / 2;
Offset = new MPSOffset {
X = (nint)(KernelWidth / 2 - pad_left),
Y = (nint)(KernelHeight / 2 - pad_top),
Z = 0
};
} else {
Offset = new MPSOffset {
X = (nint)(KernelWidth / 2),
Y = (nint)(KernelHeight / 2),
Z = 0
};
}
base.EncodeToCommandBuffer (commandBuffer, sourceImage, destinationImage);
}