L1 Regularization Paths in Linear Models by Parametric Gaussian Message Passing

Yun-Peng Li; Hans-Andrea Loeliger

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arXiv · 2604.16949

L1 Regularization Paths in Linear Models by Parametric Gaussian Message Passing

Yun-Peng Li·Hans-Andrea Loeliger

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Abstract

The paper considers the computation of L1 regularization paths in a state space setting, which includes L1 regularized Kalman smoothing, linear SVM, LASSO, and more. The paper proposes two new algorithms, which are duals of each other; the first algorithm applies to L1 regularization of independent variables while the second applies to L1 regularization of dependent variables. The heart of the proposed algorithms is parametric Gaussian message passing (i.e., Kalman-type forward-backward recursions) in the pertinent factor graphs. The proposed methods are broadly applicable, they (usually) require only matrix multiplications, and their complexity can be competitive with prior methods in some cases.

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Yun-Peng Li, Hans-Andrea Loeliger. 2026-04-18. L1 Regularization Paths in Linear Models by Parametric Gaussian Message Passing. https://arxiv.org/abs/2604.16949

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