Update CUDA code to make it build on Windows #257
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As per facebookresearch/pytorch3d#843 - to solve the build issue on Windows, one must swap the header from <torch/extension.h> to <ATen/ATen.h>, and update torch:: references to at::. This replacement is the only change in this diff, and the only one that seems to be required.
Context - CUDA doesn't like pybind11, the torch/extension.h includes pybind11.
For reference, the error was "error: too few arguments for template template parameter "Tuple""