@inproceedings{chen-etal-2026-hipo,
  title = {{HIPO}: Instruction Hierarchy via Constrained Reinforcement Learning},
  author = {Chen, Keru and Luo, Jun and Lin, Sen and Liang, Yingbin and Velasquez, Alvaro and Bastian, Nathaniel D. and Zou, Shaofeng},
  booktitle = {Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing},
  month = oct,
  year = {2026},
  address = {Budapest, Hungary},
  publisher = {Association for Computational Linguistics},
  pages = {3168--3191},
  doi = {10.18653/2026.emnlp-main.138},
  url = {https://aclanthology.org/2026.emnlp-main.138/}
}