Support padding-free for DPO #6753
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What does this PR do?
Support padding-free for DPO
The code is based on the reference from huggingface/trl#2520.
With 4 A800 machines, qwen2.5 72B, gbs256, and the dpo_mix_en dataset, under default settings, DPO LORA , enabling padding-free results in a 20% performance improvement.
Fixes # (issue)
Before submitting