Merge pull request #217330 from ConnorBaker/fix/caffe-use-pre-cudnn8

}:

let

  inherit (cudaPackages) cudatoolkit cudnn nccl;

  inherit (cudaPackages) cudatoolkit nccl;

  # The default for cudatoolkit 10.1 is CUDNN 8.0.5, the last version to support CUDA 10.1.

  # However, this caffe does not build with CUDNN 8.x, so we use CUDNN 7.6.5 instead.

  # Earlier versions of cudatoolkit use pre-8.x CUDNN, so we use the default.

  cudnn = if lib.versionOlder cudatoolkit.version "10.1"

    then cudaPackages.cudnn

    else cudaPackages.cudnn_7_6_5;

in

assert leveldbSupport -> (leveldb != null && snappy != null);