SpanBERT: Improving Pre-training by Representing and Predicting Spans Mandar Joshi author Danqi Chen author Yinhan Liu author Daniel S Weld author Luke Zettlemoyer author Omer Levy author 2020 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal joshi-etal-2020-spanbert 10.1162/tacl_a_00300 https://aclanthology.org/2020.tacl-1.5/ 2020 8 64 77