SAFER: A Structure-free Approach for Certified Robustness to Adversarial Word Substitutions Mao Ye author Chengyue Gong author Qiang Liu author 2020-07 text Proceedings of the 58th Annual Meeting of the Association for Computational Linguistics Dan Jurafsky editor Joyce Chai editor Natalie Schluter editor Joel Tetreault editor Association for Computational Linguistics Online conference publication ye-etal-2020-safer 10.18653/v1/2020.acl-main.317 https://aclanthology.org/2020.acl-main.317/ 2020-07 3465 3475