Conditional Equivalence of DPO and RLHF: Implicit Assumption, Failure Modes, and Provable Alignment
15h ago
Quick Take
DPO and RLHF are conditionally equivalent, with DPO failing under certain assumptions, leading to misalignment.
Key Points
- DPO offers simpler implementation than RLHF.
- Misalignment occurs when RLHF-optimal policies fail to prefer human responses.
- CPO introduces constraints for provable alignment and achieves state-of-the-art performance.
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