Efficient Contextual Representation Learning With Continuous Outputs Liunian Harold Li author Patrick H Chen author Cho-Jui Hsieh author Kai-Wei Chang author 2019 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal li-etal-2019-efficient 10.1162/tacl_a_00289 https://aclanthology.org/Q19-1039/ 2019 7 611 624