Hierarchical Relation Extraction with Coarse-to-Fine Grained Attention Xu Han author Pengfei Yu author Zhiyuan Liu author Maosong Sun author Peng Li author 2018-oct-nov text Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing Ellen Riloff editor David Chiang editor Julia Hockenmaier editor Jun’ichi Tsujii editor Association for Computational Linguistics Brussels, Belgium conference publication han-etal-2018-hierarchical 10.18653/v1/D18-1247 https://aclanthology.org/D18-1247/ 2018-oct-nov 2236 2245