A Multi-Level Optimization Framework for End-to-End Text Augmentation Sai Ashish Somayajula author Linfeng Song author Pengtao Xie author 2022 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal somayajula-etal-2022-multi 10.1162/tacl_a_00464 https://aclanthology.org/2022.tacl-1.20/ 2022 10 343 358