Hie-BART: Document Summarization with Hierarchical BART Kazuki Akiyama author Akihiro Tamura author Takashi Ninomiya author 2021-06 text Proceedings of the 2021 Conference of the North American Chapter of the Association for Computational Linguistics: Student Research Workshop Esin Durmus editor Vivek Gupta editor Nelson Liu editor Nanyun Peng editor Yu Su editor Association for Computational Linguistics Online conference publication akiyama-etal-2021-hie 10.18653/v1/2021.naacl-srw.20 https://aclanthology.org/2021.naacl-srw.20/ 2021-06 159 165