"We measure timings for rendering in Unreal and for all denoisers except NBG on an NVIDIA RTX 3070. Our PyTorch implementation is unable to run at real-time frame rates. Therefore, we use NVIDIA TensorRT to generate reasonably optimized CUDA kernels for inference of all neural network layers in our method."
I don't know why you would think a rasberry pi factors in to cutting edge graphics research at all, it makes no sense.