Well, this seems like a big deal. arxiv.org/abs/2603.087... "This is the first algorithm that can PAC learn even intersections of two halfspaces in time 2^o(n)."
arxiv.orgLearning Functions of HalfspacesWe give an algorithm that learns arbitrary Boolean functions of $k$ arbitrary halfspaces over $\mathbb{R}^n$, in the challenging distribution-free Probably Approximately Correct (PAC) learning model, ...
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