成电讲堂

　　4月3日，由教师发展中心主办、信息与通信工程学院承办的“名师讲堂”邀请到IEEE Fellow、香港城市大学Dapeng Oliver Wu教授，围绕“Challenges in AI Security”的主题开展精彩报告。本次讲座由信息与通信工程学院朱策教授主持。

　　Wu教授首先简要介绍了当前AI security领域的几个主要问题，包括对抗攻击、隐私问题、公平性问题以及AI滥用的问题，并针对训练数据未知条件下的模型窃取算法进行了深入讨论。

　　Wu教授谈到，部署在云端的深度学习模型往往面临着安全风险，不法分子为了降低自身训练模型的成本，或是利用窃取到的模型进行下一步的对抗攻击，会通过向模型提供阿输入数据并分析输出的方式窃取模型。但在进行模型窃取的时候，训练数据往往是未知的，针对这一问题，他的团队提出可以用生成数据作为输入来获取目标模型的输出，再利用知识蒸馏的思路训练替代模型，根据替代模型再更新合成数据的生成器，反复迭代后，由生成器生成能够较好代表原始训练数据的合成数据，从而使得替代模型也能较好地逼近目标模型。该方法的性能在多种数据集和模型下得到了实验验证。

　　在交流环节，Wu教授解答了师生提出的关于合成数据生成、模型窃取等相关问题，就AI security领域的研究给师生们提出了建议。

　　本次名师讲堂由教师发展中心主办，信息与通信工程学院承办。

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　　Dapeng Oliver Wu received Ph.D. in Electrical and Computer Engineering from Carnegie Mellon University, Pittsburgh, PA, in 2003. Currently, he is Yeung Kin Man Chair Professor of Network Science, at the Department of Computer Science, City University of Hong Kong.  His research interests are in the areas of artificial intelligence, FinTech, communications, image processing, computer vision, signal processing, and biomedical engineering. He received University of Florida Term Professorship Award in 2017, University of Florida Research Foundation Professorship Award in 2009, AFOSR Young Investigator Program (YIP) Award in 2009, ONR Young Investigator Program (YIP) Award in 2008, NSF CAREER award in 2007, the IEEE Circuits and Systems for Video Technology (CSVT) Transactions Best Paper Award for Year 2001, the Best Paper Award in GLOBECOM 2011, and the Best Paper Award in QShine 2006. He has served as Editor-in-Chief of IEEE Transactions on Network Science and Engineering, and Associate Editor of IEEE Transactions on Cloud Computing, IEEE Transactions on Communications, IEEE Transactions on Signal and Information Processing over Networks, IEEE Signal Processing Magazine, IEEE Transactions on Circuits and Systems for Video Technology, IEEE Transactions on Wireless Communications and IEEE Transactions on Vehicular Technology.  He was the founding Editor-in-Chief of Journal of Advances in Multimedia between 2006 and 2008. He has served as Technical Program Committee (TPC) Chair for IEEE INFOCOM 2012. He was elected as a Distinguished Lecturer by  IEEE Vehicular Technology Society in 2016. He is an IEEE Fellow.