RCL: Relation Contrastive Learning for Zero-Shot Relation Extraction Shusen Wang author Bosen Zhang author Yajing Xu author Yanan Wu author Bo Xiao author 2022-07 text Findings of the Association for Computational Linguistics: NAACL 2022 Marine Carpuat editor Marie-Catherine de Marneffe editor Ivan Vladimir Meza Ruiz editor Association for Computational Linguistics Seattle, United States conference publication wang-etal-2022-rcl 10.18653/v1/2022.findings-naacl.188 https://aclanthology.org/2022.findings-naacl.188/ 2022-07 2456 2468