Provably Learning a Multi-Head Attention Layer

Explore a 50-minute lecture on provably learning multi-head attention layers presented by Sitan Chen from Harvard University at IPAM's EnCORE Workshop. Delve into the computational perspective of transformer learnability, examining the gap between empirical success and theoretical understanding. Discover the first nontrivial provable algorithms and computational lower bounds for next-token prediction in a realizable setting. Learn about a novel algorithm that uses examples to sculpt a convex body containing unknown parameters, contrasting it with traditional approaches for learning multi-layer perceptrons. Gain insights into the challenges of proving efficient learning for transformer models trained with SGD, and understand the significance of this research in advancing our theoretical grasp of attention mechanisms in machine learning.