MPPO: Multi Pair-wise Preference Optimization for LLMs with Arbitrary Negative Samples Shuo Xie author Fangzhi Zhu author Jiahui Wang author Lulu Wen author Wei Dai author Xiaowei Chen author Junxiong Zhu author Kai Zhou author Bo Zheng author 2025-01 text Proceedings of the 31st International Conference on Computational Linguistics Owen Rambow editor Leo Wanner editor Marianna Apidianaki editor Hend Al-Khalifa editor Barbara Di Eugenio editor Steven Schockaert editor Association for Computational Linguistics Abu Dhabi, UAE conference publication xie-etal-2025-mppo https://aclanthology.org/2025.coling-main.104/ 2025-01 1545 1554