@inproceedings{jin-tan-2026-hi,
    title = "Hi-{ZFO}: Hierarchical Zeroth- and First-Order {LLM} Fine-Tuning via Importance-Guided Tensor Selection",
    author = "Jin, Feihu  and
      Tan, Ying",
    editor = "Liakata, Maria  and
      Moreira, Viviane P.  and
      Zhang, Jiajun  and
      Jurgens, David",
    booktitle = "Findings of the {A}ssociation for {C}omputational {L}inguistics: {ACL} 2026",
    month = jul,
    year = "2026",
    address = "San Diego, California, United States",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-acl/2026.findings-acl.239/",
    pages = "4862--4876",
    ISBN = "979-8-89176-395-1"
}