Don't use cupy NCCL for AMD backends #2855
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CuPy doesn't support the recent versions of ROCm (e.g., 5.6 and 5.7) and cupy-rocm-5.0 seems to be incompatible with these recent rocm versions. Hence, we use PyTorch NCCL (RCCL) instead of CuPy NCCL (RCCL) for AMD GPUs.