Model Extraction and Adversarial Transferability, Your BERT is Vulnerable! Xuanli He author Lingjuan Lyu author Qiongkai Xu author Lichao Sun 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 he-etal-2021-model 10.18653/v1/2021.naacl-main.161 https://aclanthology.org/2021.naacl-main.161/ 2021-06 2006 2012