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As per title, add minimal TF2 support while keeping TF1 support.
Motivation and Context
Closes #1012
Also motivated by the fact that TF2 offers relatively simple backwards-compatibility with TF1-like code, for now.
As noted in this comment, most of the change is just about replacing that one import. The second big thing is
tensorflow.contrib
, but updating for it seems reasonably doable. I am mostly worried about the hidden changes to agent performance and/or running time.TODO
tensorflow.compat.v1
to import TF1-like tensorflow.tensorflow.contrib
(mainlytensorflow.contrib.layers
).Types of changes
Checklist:
pytest
andpytype
both pass (by runningmake pytest
andmake type
).