After a few hours of debugging, uninstalling, reinstalling, and generally trying to get this code working, I've found the root cause of the problem:

1. This repository requires TensorFlow 2.0.0+

2. This repository also requires Python 3.7+

3. TensorFlow 2.0.0+ only supports Python 3.6 and below.

Can someone provide some guidance on how to get TensorFlow working on a version of Python that isn't supported?