CLEVE: Contrastive Pre-training for Event Extraction Ziqi Wang author Xiaozhi Wang author Xu Han author Yankai Lin author Lei Hou author Zhiyuan Liu author Peng Li author Juanzi Li author Jie Zhou author 2021-08 text Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (Volume 1: Long Papers) Chengqing Zong editor Fei Xia editor Wenjie Li editor Roberto Navigli editor Association for Computational Linguistics Online conference publication wang-etal-2021-cleve 10.18653/v1/2021.acl-long.491 https://aclanthology.org/2021.acl-long.491/ 2021-08 6283 6297