Bi-Directional Iterative Prompt-Tuning for Event Argument Extraction Lu Dai author Bang Wang author Wei Xiang author Yijun Mo author 2022-12 text Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing Yoav Goldberg editor Zornitsa Kozareva editor Yue Zhang editor Association for Computational Linguistics Abu Dhabi, United Arab Emirates conference publication dai-etal-2022-bi 10.18653/v1/2022.emnlp-main.419 https://aclanthology.org/2022.emnlp-main.419/ 2022-12 6251 6263