OTPO uses unbalanced optimal transport to reweight token-level log-likelihood ratios in DPO, reporting up to 10.9% higher length-controlled win rate on AlpacaEval2 than DPO.
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Optimal Transport-Based Token Weighting scheme for Enhanced Preference Optimization
OTPO uses unbalanced optimal transport to reweight token-level log-likelihood ratios in DPO, reporting up to 10.9% higher length-controlled win rate on AlpacaEval2 than DPO.