Alleviating Exposure Bias via Multi-level Contrastive Learning and Deviation Simulation in Abstractive Summarization Jiawen Xie author Qi Su author Shaoting Zhang author Xiaofan Zhang author 2023-07 text Findings of the Association for Computational Linguistics: ACL 2023 Anna Rogers editor Jordan Boyd-Graber editor Naoaki Okazaki editor Association for Computational Linguistics Toronto, Canada conference publication xie-etal-2023-alleviating 10.18653/v1/2023.findings-acl.617 https://aclanthology.org/2023.findings-acl.617/ 2023-07 9732 9747