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This patch ports the training class to TF2. Most of the class needs
little porting as the TrainingEpochStats class is already completely
eager. The partially_restore_from_checkpoint function did not updating
to use new TF APIs. Future patches will fix everything up to use proper
TF2 APIs, but for now this works. Some future work needs to be done when
it comes up in tests to restore the step value as TF2 no longer contains
global state.