In our CI pipeline, we regenerate all sources rather than relying on committed files. This is causing master build failures since this commit: #438

Expected Behavior

Build and tests pass

Current Behavior

Unit test python fails

Steps to reproduce

1. Re-generate python files with cd protos; make gen-python
2. Run unit tests with cd sdk/python; pip install -r requirements-ci.txt && pip install -e . && pytest --junitxml=python-sdk-test-report.xml

Specifications

latest master

Possible Solution

Add required dependencies to requirements. tensorflow_metadata?