Improving Sequence-to-Sequence Pre-training via Sequence Span Rewriting Wangchunshu Zhou author Tao Ge author Canwen Xu author Ke Xu author Furu Wei author 2021-11 text Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Online and Punta Cana, Dominican Republic conference publication zhou-etal-2021-improving-sequence 10.18653/v1/2021.emnlp-main.45 https://aclanthology.org/2021.emnlp-main.45/ 2021-11 571 582