Hierarchical Region Learning for Nested Named Entity Recognition Xinwei Long author Shuzi Niu author Yucheng Li author 2020-11 text Findings of the Association for Computational Linguistics: EMNLP 2020 Trevor Cohn editor Yulan He editor Yang Liu editor Association for Computational Linguistics Online conference publication long-etal-2020-hierarchical 10.18653/v1/2020.findings-emnlp.430 https://aclanthology.org/2020.findings-emnlp.430/ 2020-11 4788 4793