Improving Cascade Decoding with Syntax-aware Aggregator and Contrastive Learning for Event Extraction Sheng Zeyu author Liang Yuanyuan author Lan Yunshi author 2023-08 text eng Proceedings of the 22nd Chinese National Conference on Computational Linguistics Maosong Sun editor Bing Qin editor Xipeng Qiu editor Jing Jiang editor Xianpei Han editor Chinese Information Processing Society of China Harbin, China conference publication zeyu-etal-2023-improving https://aclanthology.org/2023.ccl-1.64/ 2023-08 748 760