HIBRIDS: Attention with Hierarchical Biases for Structure-aware Long Document Summarization Shuyang Cao author Lu Wang author 2022-05 text Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Smaranda Muresan editor Preslav Nakov editor Aline Villavicencio editor Association for Computational Linguistics Dublin, Ireland conference publication cao-wang-2022-hibrids 10.18653/v1/2022.acl-long.58 https://aclanthology.org/2022.acl-long.58/ 2022-05 786 807