Perturbation Based Learning for Structured NLP Tasks with Application to Dependency Parsing Amichay Doitch author Ram Yazdi author Tamir Hazan author Roi Reichart author 2019 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal doitch-etal-2019-perturbation 10.1162/tacl_a_00291 https://aclanthology.org/Q19-1041/ 2019 7 643 659