HiCLRE: A Hierarchical Contrastive Learning Framework for Distantly Supervised Relation Extraction Dongyang Li author Taolin Zhang author Nan Hu author Chengyu Wang author Xiaofeng He author 2022-05 text Findings of the Association for Computational Linguistics: ACL 2022 Smaranda Muresan editor Preslav Nakov editor Aline Villavicencio editor Association for Computational Linguistics Dublin, Ireland conference publication li-etal-2022-hiclre 10.18653/v1/2022.findings-acl.202 https://aclanthology.org/2022.findings-acl.202/ 2022-05 2567 2578