OpineSum: Entailment-based self-training for abstractive opinion summarization Annie Louis author Joshua Maynez 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 louis-maynez-2023-opinesum 10.18653/v1/2023.findings-acl.686 https://aclanthology.org/2023.findings-acl.686/ 2023-07 10774 10790