AttenWalker: Unsupervised Long-Document Question Answering via Attention-based Graph Walking Yuxiang Nie author Heyan Huang author Wei Wei author Xian-Ling Mao 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 nie-etal-2023-attenwalker 10.18653/v1/2023.findings-acl.862 https://aclanthology.org/2023.findings-acl.862/ 2023-07 13650 13663