Hybrid Hierarchical Retrieval for Open-Domain Question Answering Manoj Ghuhan Arivazhagan author Lan Liu author Peng Qi author Xinchi Chen author William Yang Wang author Zhiheng Huang author 2023-07 text Findings of the Association for Computational Linguistics: ACL 2023 Anna Rogers editor Jordan Boyd-Graber editor Naoaki Okazaki editor Association for Computational Linguistics Toronto, Canada conference publication arivazhagan-etal-2023-hybrid 10.18653/v1/2023.findings-acl.679 https://aclanthology.org/2023.findings-acl.679/ 2023-07 10680 10689