[DPO] fix DPO + GC issues
#927
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lvwerra
approved these changes
Oct 31, 2023
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What does this PR do?
Fixes #801
Fixes huggingface/peft#1056
For DPO, when one uses
gradient_checkpointingwe need to attach hooks to enable inputs to have requires grad to true, otherwise the training will either silently fail or completely failcc @lvwerra