Merge pull request #216907 from NixOS/tensor-cleanup

# it would also make the default tensorflow package unfree. See

# https://groups.google.com/a/tensorflow.org/forum/#!topic/developers/iRCt5m4qUz0

, cudaSupport ? false, cudaPackages ? {}

, mklSupport ? false, mkl ? null

, mklSupport ? false, mkl

, tensorboardSupport ? true

# XLA without CUDA is broken

, xlaSupport ? cudaSupport

# unsupported combination

assert ! (stdenv.isDarwin && cudaSupport);

assert mklSupport -> mkl != null;

let

  withTensorboard = (pythonOlder "3.6") || tensorboardSupport;