Proper way of attach LibTorch built from source in C++ project

C++
1

Hey,

So far I’ve been using LibTorch downloaded from pytorch.org (pre-built), however I realized that building PyTorch from source on my machine gives me huge speed increase, so I would like to do that with LibTorch too. I built it using these instructions.

Can anyone explain me how to use built from source LibTorch in C++ project? Its structure slightly differs from this downloaded from official website and I get some compilation errors.

Thank you

3

You can also use your build directly without going through conda:

mkdir build
cd build
cmake -DCMAKE_PREFIX_PATH=<whatever>/pytorch/torch/share/cmake ..
make

Where the pytorch is the top level folder you have the PyTorch repo checked out to (e.g. the folder produced when you run git clone https://github.com/pytorch/pytorch.git

4

The fastest way probably from the point where you are at is to just use the LibTorch from the PyTorch you built. It contains all you need in torch/lib, torch/shared, torch/include from the Python installed directory (/usr/local/lib/python*/dist-packages/torch/* for me, try torch.__file__ if you can’t find it).

Best regards

Thomas

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