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NVIDIA requires that one registers before downloading CUDA, cuDNN and nccl which makes it impractical to download them as part of an automated build, thus the first step is to download download cuda_9.1.85.2_linux, cuda_9.1.85.1_linux, cuda_9.1.85.3_linux, cuda_9.1.85_387.26_linux, cudnn-9.0-linux-x64-v7.5.0.56.tgz and nccl-repo-ubuntu1604-2.4.2-ga-cuda9.0_1-1_amd64.deb from the NVIDIA servers.
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