Ranking and Sampling in Open-Domain Question Answering Yanfu Xu author Zheng Lin author Yuanxin Liu author Rui Liu author Weiping Wang author Dan Meng author 2019-11 text Proceedings of the 2019 Conference on Empirical Methods in Natural Language Processing and the 9th International Joint Conference on Natural Language Processing (EMNLP-IJCNLP) Kentaro Inui editor Jing Jiang editor Vincent Ng editor Xiaojun Wan editor Association for Computational Linguistics Hong Kong, China conference publication xu-etal-2019-ranking 10.18653/v1/D19-1245 https://aclanthology.org/D19-1245/ 2019-11 2412 2421