Security of Machine Learning Systems

Speaker: Mr. Ping-Yeh Chiang
Date: 2021-02-22 (Mon) 10:30 - 12:30
Location: Auditorium 122 at CITI
Host: Jun-Cheng Chen


As machine learning models are used in more safety-critical areas, such as self-driving cars or medical analysis, it becomes increasingly important to ensure that they are safe against malicious actors. I will start out my talk by introducing a popular security topic: adversarial examples, where an imperceptible perturbation could change the prediction of a classification model. Even though various methods have been proposed to defend against these adversarial examples, due to the non-convex nature of neural networks, verifying the model’s robustness against adversarial examples remains challenging: the verifiable models are either too small or the certificates are too loose. To overcome the challenge, I will then introduce methods that allow us to defend against adversarial examples while making the model easily verifiable at the same time. Finally, I will demonstrate how the approach can be adapted to defend against adversarial examples for state-of-the-art object detectors. To end, I will touch on a couple of other security problems that I worked on to highlight that there are many more security problems for deep learning models beyond adversarial examples.


Ping-Yeh Chiang is a third-year PhD student at the University of Maryland - College Park advised by Professor Tom Goldstein. His main interest is in verifiable machine learning and the security of deep learning systems. Recently, Ping-Yeh Chiang is interested in exploring methods to improve the general robustness of neural networks.