Improving Abstractive Dialogue Summarization with Hierarchical Pretraining and Topic Segment MengNan Qi author Hao Liu author YuZhuo Fu author Ting Liu author 2021-11 text Findings of the Association for Computational Linguistics: EMNLP 2021 Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Punta Cana, Dominican Republic conference publication qi-etal-2021-improving-abstractive 10.18653/v1/2021.findings-emnlp.97 https://aclanthology.org/2021.findings-emnlp.97/ 2021-11 1121 1130