Minor fixes to third party code. - Fix externally broken test input_test.py - Add Cython to object detection REQUIRED_PACKAGES
Minor fixes to third party code.
- Fix externally broken test input_test.py
- Add Cython to object detection REQUIRED_PACKAGES

PiperOrigin-RevId: 191338837

derekjchow/models,cshallue/models,cshallue/models,derekjchow/models,cshallue/models,tombstone/models,cshallue/models,alexgorban/models,alexgorban/models,derekjchow/models,derekjchow/models,alexgorban/models,tombstone/models,cshallue/models,tombstone/models,alexgorban/models,tombstone/models,derekjchow/models,tombstone/models,alexgorban/models,tombstone/models