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PyTorch was born from Lua Torch but they're not interchangeable and noting installation issues regarding Lua Torch when the article is discussing PyTorch is likely confusing.

PyTorch helpfully provides clear installation instructions for each platform and package manager at http://pytorch.org/ and the team have consistently been careful to ensure they work simply.

pretty easy to get started on their homepage: http://pytorch.org/

for example, python 2.7/ pip/ osx/

pip install http://download.pytorch.org/whl/torch-0.3.0.post4-cp27-none-... pip install torchvision

I have used torch without issues but that was a while ago. It looks like Lua Torch was sort of deprecated in favor of PyTorch