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• W2024254345 abstract "Many modern tools in machine learning and signal processing, such as sparse dictionary learning, principal component analysis, non-negative matrix factorization, K-means clustering, and so on, rely on the factorization of a matrix obtained by concatenating high-dimensional vectors from a training collection. While the idealized task would be to optimize the expected quality of the factors over the underlying distribution of training vectors, it is achieved in practice by minimizing an empirical average over the considered collection. The focus of this paper is to provide sample complexity estimates to uniformly control how much the empirical average deviates from the expected cost function. Standard arguments imply that the performance of the empirical predictor also exhibit such guarantees. The level of genericity of the approach encompasses several possible constraints on the factors (tensor product structure, shift-invariance, sparsity...), thus providing a unified perspective on the sample complexity of several widely used matrix factorization schemes. The derived generalization bounds behave proportional to (log (n)/n) <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1/2</sup> with respect to the number of samples n for the considered matrix factorization techniques." @default.
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• W2024254345 date "2015-06-01" @default.
• W2024254345 modified "2023-09-26" @default.
• W2024254345 title "Sample Complexity of Dictionary Learning and Other Matrix Factorizations" @default.
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• W2024254345 doi "https://doi.org/10.1109/tit.2015.2424238" @default.
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