message: Fix torchvision installation
diff: set -ex
  source /tmp/venv/bin/activate
  +
  +# install torchvision from master
  +# the one on pypi requires cuda
  +pip install -q git+https://github.com/pytorch/vision.git
  +
  cd /tmp/pytorch
  CI=1 exec "scripts/onnx/test.sh"
  