message: Try nightly instead of rc.
  Follow-up from previous change, will also be rolledback in ~1hr.
diff: @@ -20,7 +20,7 @@ mkdir mm_test
  cd mm_test
  virtualenv . -ppython3.5
  source bin/activate
  -pip install -q tensorflow==2.1.0rc1 scipy==1.1.0
  +pip install -q tf-nightly==2.1.0.dev20191217 scipy==1.1.0
  python -c 'import tensorflow'
  #source tensorflow/tools/ci_build/release/common.sh
  