@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",
    editor = "Lee, Hung-Yi  and
      Dev, Sunipa  and
      Li, Jessy  and
      Elliott, Desmond",
    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",
    url = "https://aclanthology.org/2026.emnlp-main.138/",
    pages = "3168--3191",
    ISBN = "979-8-89176-459-0"
}