Reference-free Summarization Evaluation via Semantic Correlation and Compression Ratio Yizhu Liu author Qi Jia author Kenny Zhu author 2022-07 text Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Marine Carpuat editor Marie-Catherine de Marneffe editor Ivan Vladimir Meza Ruiz editor Association for Computational Linguistics Seattle, United States conference publication liu-etal-2022-reference 10.18653/v1/2022.naacl-main.153 https://aclanthology.org/2022.naacl-main.153/ 2022-07 2109 2115