A Joint Named-Entity Recognizer for Heterogeneous Tag-sets Using a Tag Hierarchy Genady Beryozkin author Yoel Drori author Oren Gilon author Tzvika Hartman author Idan Szpektor author 2019-07 text Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics Anna Korhonen editor David Traum editor Lluís Màrquez editor Association for Computational Linguistics Florence, Italy conference publication beryozkin-etal-2019-joint 10.18653/v1/P19-1014 https://aclanthology.org/P19-1014/ 2019-07 140 150