Universal Adversarial Attacks with Natural Triggers for Text Classification Liwei Song author Xinwei Yu author Hsuan-Tung Peng author Karthik Narasimhan author 2021-06 text Proceedings of the 2021 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Kristina Toutanova editor Anna Rumshisky editor Luke Zettlemoyer editor Dilek Hakkani-Tur editor Iz Beltagy editor Steven Bethard editor Ryan Cotterell editor Tanmoy Chakraborty editor Yichao Zhou editor Association for Computational Linguistics Online conference publication song-etal-2021-universal 10.18653/v1/2021.naacl-main.291 https://aclanthology.org/2021.naacl-main.291/ 2021-06 3724 3733