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We moved all symm_mem code into a folder ([CudaDMAConnectivity](https://github.com/pytorch/pytorch/pull/155573)) but somehow forgot update for CudaDMAConnectivity in the CMakeList. Users see errors: RuntimeError: DMA connectivity detector for cuda over nvlink is not available while torch.distributed.init_process_group(backend=backend). So this PR should fix it. Pull Request resolved: https://github.com/pytorch/pytorch/pull/155823 Approved by: https://github.com/Skylion007