Bipartite Flat-Graph Network for Nested Named Entity Recognition Ying Luo author Hai Zhao author 2020-07 text Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics Dan Jurafsky editor Joyce Chai editor Natalie Schluter editor Joel Tetreault editor Association for Computational Linguistics Online conference publication luo-zhao-2020-bipartite 10.18653/v1/2020.acl-main.571 https://aclanthology.org/2020.acl-main.571/ 2020-07 6408 6418