OpenNRE: An Open and Extensible Toolkit for Neural Relation Extraction Xu Han author Tianyu Gao author Yuan Yao author Deming Ye author Zhiyuan Liu author Maosong Sun author 2019-11 text Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP): System Demonstrations Sebastian Padó editor Ruihong Huang editor Association for Computational Linguistics Hong Kong, China conference publication han-etal-2019-opennre 10.18653/v1/D19-3029 https://aclanthology.org/D19-3029/ 2019-11 169 174