Papers › f-PO: Generalizing Preference Optimization with f-divergence Minimization

f-PO: Generalizing Preference Optimization with f-divergence Minimization

29 Oct 2024arXiv:2410.21662archive 2025-07-28

Jiaqi Han, Mingjian Jiang, Yuxuan Song, Jure Leskovec, Stefano Ermon, Minkai Xu

Preference optimization has made significant progress recently, with numerous methods developed to align language models with human preferences. This paper introduces f-divergence Preference Optimization (f-PO), a novel framework that generalizes and extends existing approaches. f-PO minimizes f-divergences between the optimized policy and the optimal policy, encompassing a broad family of alignment methods using various divergences. Our approach unifies previous algorithms like DPO and EXO, while offering new variants through different choices of f-divergences. We provide theoretical analysis of f-PO's properties and conduct extensive experiments on state-of-the-art language models using benchmark datasets. Results demonstrate f-PO's effectiveness across various tasks, achieving superior performance compared to existing methods on popular benchmarks such as AlpacaEval 2, Arena-Hard, and MT-Bench. Additionally, we present ablation studies exploring the impact of different f-divergences, offering insights into the trade-offs between regularization and performance in offline preference optimization. Our work contributes both practical algorithms and theoretical understanding to the field of language model alignment. Code is available at https://github.com/MinkaiXu/fPO.

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