HacRED: A Large-Scale Relation Extraction Dataset Toward Hard Cases in Practical Applications Qiao Cheng author Juntao Liu author Xiaoye Qu author Jin Zhao author Jiaqing Liang author Zhefeng Wang author Baoxing Huai author Nicholas Jing Yuan author Yanghua Xiao author 2021-08 text Findings of the Association for Computational Linguistics: ACL-IJCNLP 2021 Chengqing Zong editor Fei Xia editor Wenjie Li editor Roberto Navigli editor Association for Computational Linguistics Online conference publication cheng-etal-2021-hacred 10.18653/v1/2021.findings-acl.249 https://aclanthology.org/2021.findings-acl.249/ 2021-08 2819 2831