How to continue training from a checkpoint with Trainer?

[Superskyyy]

I've been using PPO/RLOOTrainer and it seems the resume_from_checkpoint doens't work, upon seeing the code I was surprised that nothing implemented the checkpointing loading mechanism not even using the one from huggingface transfomers, (the trainer.train method doesn't take a resume_from_checkpoint arg)

How can I load back the checkpoint and resume the training? I assume people have been using this feature and I somehow missed the guide to do so.

[wojtess]

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