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The Taub Faculty of Computer Science Events and Talks

Discovering and Erasing Unsafe Concepts
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Niv Cohen
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Tuesday, 16.07.2024, 11:30
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Room 1061, Meyer Building

The rapid growth of generative models allows an ever-increasing variety of capabilities. Yet, these models may also produce undesired content such as unsafe images, private information, or copyrighted material.

In this talk, I will discuss practical methods to prevent undesired generation and the evaluation of such methods. First, I will show how the challenge of avoiding undesired generations manifested itself in a simple Capture-the-Flag LLM setting, where even our top defense strategy was breached. Next, I will demonstrate a similar vulnerability in state-of-the-art concept erasure methods for Text-to-Image models. Finally, I will describe the notion of ‘Unconditional Concept Erasure’ aiming to mitigate these issues. I will show that Task Vectors can achieve Unconditional Concept Erasure, and discuss the opportunities and limitations of applying Task Vectors in practice.

Niv is a postdoctoral researcher at New York University hosted by Prof. Chinmay Hegde. He received a BSc. in mathematics with physics in the Technion Excellence Program. He received a Ph.D. in computer science from the Hebrew University of Jerusalem, advised by Prof. Yedid Hoshen. Niv was awarded the Israeli data science scholarship for outstanding postdoctoral fellows (VATAT). He is interested in model personalization, anomaly detection, and AI Safety for Language and Vision and Language models.