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McKelvey School of Engineering

Brown School

Analyzing Safety of Learning-Enabled Systems: Bottom-up and Top-down Perspectives

Friday, March 1 | 11:00 AM - 12:00 PM

Henry A. and Elvira H. Jubel Hall, 121

Ravi Mangal 
Postdoctoral Researcher
Cylab 
Carnegie Mellon University
 

As deep neural networks (DNNs) demonstrate growing capabilities to solve complex tasks, there is a push to incorporate them as components in software and cyber-physical systems.  To reap the benefits of these learning-enabled systems without propagating harms, there is an urgent need to develop tools and methodologies for evaluating their safety. Formal methods are a powerful set of tools for analyzing behaviors of software systems. However, formal analysis of learning-enabled systems is challenging; DNNs are notoriously difficult to interpret and lack logical specifications, the environments in which these systems operate can be difficult to model mathematically, and existing formal methods do not scale to these complex systems.
 
In this talk, I will present a bottom-up and a top-down perspective for the analysis of such systems. The bottom-up perspective focuses on analyzing DNNs in isolation. To address the challenges in intepreting and specifying DNN behavior, I will present a logical specification language designed to facilitiate writing specifications about vision-based DNNs in terms of high-level, human-understandable concepts. I will then demonstrate how we can leverage vision-language models such as CLIP to encode and check these specifications. The top-down perspective focuses on analyzing learning-enabled systems as a whole. To address the challenges in modeling the environment and scaling formal analysis, I will present new probabilistic abstractions for DNN-based perception components in learning-enabled cyber-physical systems that make it feasible to formally analyze such systems.
 

Talk Location: Jubel 121

Event Type

Seminar/Colloquia

Schools

McKelvey School of Engineering

Topic

Science & Technology

Department
Computer Science & Engineering
Event Contact

cody.copeland@wustl.edu

Speaker Information

Ravi Mangal is a postdoctoral researcher at Carnegie Mellon University in the Security and Privacy Institute (CyLab) hosted by Dr. Corina Pasareanu. He graduated with a PhD in Computer Science from Georgia Institute of Technology in 2020 advised by Dr. Alex Orso. He is interested in all aspects of designing and applying formal methods for assuring the correctness and safety of software systems. His current research focuses on developing algorithms and methodologies for formally analyzing the safety and trustworthiness of learning-enabled systems.

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