How to get cuda cudnn nccl build version?

1

When build from source or install from anaconda channel, we would like to know the exact version of CUDA, CUDNN and NCCL. How could we do that?

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CUDNN version: https://github.com/pytorch/pytorch/issues/698#issuecomment-326806780
torch.backends.cudnn.version()

CUDA version: Pytorch 0.4 get cuda version
torch.version.cuda

NCCL version: How to check if NCCL is installed correctly and can be used by PyTorch?
torch.cuda.nccl.version()

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