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DTSTAMP:20260403T221634
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SUMMARY:TILOS-HDSI Seminar: Engineering Interpretable and Faithful AI Systems
DESCRIPTION:René Vidal\, University of Pennsylvania \nAbstract: Large Language Models (LLMs) and Vision Language Models (VLMs) have achieved remarkable performance across a wide range of tasks. However\, their growing deployment has exposed fundamental limitations in faithfulness\, safety\, and transparency. In this talk\, I will present a unified perspective on addressing these challenges through principled model interventions and interpretable decision-making frameworks. I first introduce Information Pursuit (IP)\, an interpretable-by-design prediction framework that replaces opaque reasoning with a sequence of informative\, user-interpretable queries\, yielding concise explanations alongside accurate predictions. I then present Parsimonious Concept Engineering (PaCE)\, an approach that improves faithfulness and alignment by selectively removing undesirable internal activations\, mitigating hallucinations and biased language while preserving linguistic competence. Results across text\, vision\, and medical tasks illustrate how these ideas advance transparency without sacrificing performance. Together\, these contributions point toward a broader direction for building AI systems that are powerful\, faithful\, and aligned with human values. \n\nRené Vidal is the Penn Integrates Knowledge and Rachleff University Professor of Electrical and Systems Engineering and Radiology at the University of Pennsylvania\, where he directs the Center for Innovation in Data Engineering and Science (IDEAS) and serves as Co-Chair of Penn AI. He is also an Amazon Scholar\, Affiliated Chief Scientist at NORCE\, and former Associate Editor-in-Chief of IEEE Transactions on Pattern Analysis and Machine Intelligence. Professor Vidal’s research advances the mathematical foundations of deep learning and trustworthy AI\, with broad impact across computer vision and biomedical data science. His contributions have been recognized with major honors\, including the IEEE Edward J. McCluskey Technical Achievement Award\, the D’Alembert Faculty Award\, the J.K. Aggarwal Prize\, the ONR Young Investigator Award\, the NSF CAREER Award\, and best paper awards in machine learning\, computer vision\, signal processing\, control\, and medical robotics. He is a Fellow of ACM\, AIMBE\, IEEE\, and IAPR\, and a Sloan Fellow. \nZoom: https://bit.ly/TILOS-Seminars
URL:https://tilos.ai/event/tilos-hdsi-seminar-engineering-interpretable-and-faithful-ai-systems/
LOCATION:HDSI 123 and Virtual\, 3234 Matthews Ln\, La Jolla\, CA\, 92093\, United States
CATEGORIES:TILOS Seminar Series
ATTACH;FMTTYPE=image/jpeg:https://tilos.ai/wp-content/uploads/2025/10/rene-vidal-e1759946821354.jpg
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CREATED:20250923T164943Z
LAST-MODIFIED:20260326T182945Z
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SUMMARY:Optimization for ML and AI Seminar: A survey of the mixing times of the Proximal Sampler algorithm
DESCRIPTION:Andre Wibisono\, Yale University \nAbstract: Sampling is a fundamental algorithmic task with many connections to optimization. In this talk\, we survey a recent algorithm for sampling known as the Proximal Sampler\, which can be seen as a proximal discretization of the continuous-time Langevin dynamics\, and achieves the current state-of-the-art iteration complexity for sampling in discrete time. We survey the mixing time guarantees of the Proximal Sampler algorithm and show they match the guarantees for the Langevin dynamics. When the target distribution satisfies log-concavity or isoperimetry\, the Proximal Sampler has rapid convergence guarantees. We illustrate the proof technique via the strong data processing inequality along the Gaussian channel and its time reversal under isoperimetry. \n\nAndre Wibisono is an assistant professor in the Department of Computer Science at Yale University\, with a secondary appointment in the Department of Statistics & Data Science. His research interests are in the design and analysis of algorithms for machine learning\, in particular for problems in optimization\, sampling\, and game theory. He received his BS degrees in Mathematics and in Computer Science from MIT\, his MEng in Computer Science from MIT\, his MA in Statistics from UC Berkeley\, and his PhD in Computer Science from UC Berkeley. He has done postdoctoral research at the University of Wisconsin-Madison and at the Georgia Institute of Technology. \nZoom: https://bit.ly/Opt-AI-ML
URL:https://tilos.ai/event/optimization-for-ml-and-ai-seminar-a-survey-of-the-mixing-times-of-the-proximal-sampler-algorithm/
LOCATION:HDSI 123 and Virtual\, 3234 Matthews Ln\, La Jolla\, CA\, 92093\, United States
CATEGORIES:TILOS Seminar Series,TILOS Sponsored Event
ATTACH;FMTTYPE=image/jpeg:https://tilos.ai/wp-content/uploads/2025/09/wibisono-andre-e1758646059816.jpg
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