Mask-then-Fill: A Flexible and Effective Data Augmentation Framework for Event Extraction Jun Gao author Changlong Yu author Wei Wang author Huan Zhao author Ruifeng Xu author 2022-12 text Findings of the Association for Computational Linguistics: EMNLP 2022 Yoav Goldberg editor Zornitsa Kozareva editor Yue Zhang editor Association for Computational Linguistics Abu Dhabi, United Arab Emirates conference publication gao-etal-2022-mask 10.18653/v1/2022.findings-emnlp.332 https://aclanthology.org/2022.findings-emnlp.332/ 2022-12 4537 4544