Harvesting and Refining Question-Answer Pairs for Unsupervised QA Zhongli Li author Wenhui Wang author Li Dong author Furu Wei author Ke Xu author 2020-07 text Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics Dan Jurafsky editor Joyce Chai editor Natalie Schluter editor Joel Tetreault editor Association for Computational Linguistics Online conference publication li-etal-2020-harvesting 10.18653/v1/2020.acl-main.600 https://aclanthology.org/2020.acl-main.600/ 2020-07 6719 6728