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Feb 18, 2022
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Documenting cuda 11.5 windows issue #1826

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21 changes: 21 additions & 0 deletions advanced_source/cpp_extension.rst
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Expand Up @@ -206,6 +206,27 @@ into C++. Our primary datatype for all computations will be
also that we can include ``<iostream>`` or *any other C or C++ header* -- we have
the full power of C++11 at our disposal.

Note that CUDA-11.5 nvcc will hit internal compiler error while parsing torch/extension.h on Windows.
To workaround the issue, move python binding logic to pure C++ file.
Example use:

.. code-block:: cpp

#include <ATen/ATen.h>
at::Tensor SigmoidAlphaBlendForwardCuda(....)

Instead of:

.. code-block:: cpp

#include <torch/extension.h>
torch::Tensor SigmoidAlphaBlendForwardCuda(...)

Currently open issue for nvcc bug `here
<https://github.com/pytorch/pytorch/issues/69460>`_.
Complete workaround code example `here
<https://github.com/facebookresearch/pytorch3d/commit/cb170ac024a949f1f9614ffe6af1c38d972f7d48>`_.

Forward Pass
************

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