Your OS type and version and Python, PyTorch and
  TensorFlow versions when applicable.
A short, self-contained, code snippet that allows us to reproduce the bug in
  less than 30s.
The full traceback if an exception is raised.
Attach any other additional information, like screenshots, you think may help.

To get the OS and software versions automatically, run the following command:

transformers-cli env
You can also run the same command from the root of the repository: