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This switches the PyTorch we install use to CPU only.
As discussed in #10758 we see funny things when linking libtorch (which is in general linked to a different version of CUDA than TVM will use) into libtvm.
This also cleans up some of the cuda use in the frontend tests (so hopefully it can run on CPU only but will make use of the GPU if available locally). This is a bit of a tough call, it might make sense to remove all optional CUDA use with the thought that we want local tests to reproduce the CI as closely as possible, if you have comments, I'm all ears.