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Iterative regularization for convex regularizers

Cesare Molinari · Mathurin Massias · Lorenzo Rosasco · Silvia Villa

Keywords: [ Algorithms, Optimization and Computation Methods ] [ Convex optimization ]


We study iterative regularization for linear models, when the bias is convex but not necessarily strongly convex. We characterize the stability properties of a primal-dual gradient based approach, analyzing its convergence in the presence of worst case deterministic noise. As a main example, we specialize and illustrate the results for the problem of robust sparse recovery. Key to our analysis is a combination of ideas from regularization theory and optimization in the presence of errors. Theoretical results are complemented by experiments showing that state-of-the-art performances are achieved with considerable computational speed-ups.

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