DREAM: A Challenge Data Set and Models for Dialogue-Based Reading Comprehension Kai Sun author Dian Yu author Jianshu Chen author Dong Yu author Yejin Choi author Claire Cardie author 2019 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal sun-etal-2019-dream 10.1162/tacl_a_00264 https://aclanthology.org/Q19-1014/ 2019 7 217 231