Sparsity and Sentence Structure in Encoder-Decoder Attention of Summarization Systems Potsawee Manakul author Mark Gales 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 manakul-gales-2021-sparsity 10.18653/v1/2021.emnlp-main.739 https://aclanthology.org/2021.emnlp-main.739/ 2021-11 9359 9368