A Discrete Hard EM Approach for Weakly Supervised Question Answering Sewon Min author Danqi Chen author Hannaneh Hajishirzi author Luke Zettlemoyer 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 min-etal-2019-discrete 10.18653/v1/D19-1284 https://aclanthology.org/D19-1284/ 2019-11 2851 2864