FIPO: Free-form Instruction-oriented Prompt Optimization with Preference Dataset and Modular Fine-tuning Schema Junru Lu author Siyu An author Min Zhang author Yulan He author Di Yin author Xing Sun 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 lu-etal-2025-fipo https://aclanthology.org/2025.coling-main.731/ 2025-01 11029 11047