[PPOTrainer] make the reference model optional
#67
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lvwerra
approved these changes
Dec 30, 2022
Co-authored-by: Leandro von Werra <lvwerra@users.noreply.github.com>
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This PR makes passing the reference model optional for the trainer, so that a user can just create a model without creating a reference model, and pass it to the trainer to create a shared model
cc @lvwerra @lewtun
This PR also refactors the trainer test, and adds nice tests too