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Meta Learning in Bandits within Shared Affine Subspaces
April 2, 2024, 7:42 p.m. | Steven Bilaj, Sofien Dhouib, Setareh Maghsudi
cs.LG updates on arXiv.org arxiv.org
Abstract: We study the problem of meta-learning several contextual stochastic bandits tasks by leveraging their concentration around a low-dimensional affine subspace, which we learn via online principal component analysis to reduce the expected regret over the encountered bandits. We propose and theoretically analyze two strategies that solve the problem: One based on the principle of optimism in the face of uncertainty and the other via Thompson sampling. Our framework is generic and includes previously proposed approaches …
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