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Update libtorch docs #21150

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15 changes: 11 additions & 4 deletions docs/libtorch.rst
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Expand Up @@ -11,14 +11,21 @@ Building libtorch
You can use a python script/module located in tools package to build libtorch
::
cd <pytorch_root>
# export some required environment variables
python -m tools.build_libtorch

# Make a new folder to build in to avoid polluting the source directories
mkdir build_libtorch && cd build_libtorch

Alternatively, you can invoke a shell script in the same directory to achieve the same goal
# You might need to export some required environment variables here.
Normally setup.py sets good default env variables, but you'll have to do
that manually.
python ../tools/build_libtorch.py


Alternatively, you can call setup.py normally and then copy the built cpp libraries. This method may have side effects to your active Python installation.
::
cd <pytorch_root>
ONNX_NAMESPACE=onnx_torch bash tools/build_pytorch_libs.sh --use-nnpack caffe2
python setup.py build

ls torch/lib/tmp_install # output is produced here
ls torch/lib/tmp_install/lib/libtorch.so # of particular interest

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