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• W4372267286 abstract "Generalized Approximate Message Passing (GAMP) allows for Bayesian inference in linear models with non-identically independently distributed (n.i.i.d.) priors and n.i.i.d. measurements of the linear mixture outputs. It represents an efficient technique for approximate inference, which becomes accurate when both rows and columns of the measurement matrix can be treated as sets of independent vectors and both dimensions become large. It has been shown that the fixed points of GAMP correspond to the extrema of a large system limit of the Bethe Free Energy (LSL-BFE), which represents a meaningful approximation optimization criterion regardless of whether the measurement matrix exhibits the independence properties. However, the convergence of (G)AMP can be notoriously problematic for certain measurement matrices, and the only sure fixes so far are damping (by a difficult-to-determine amount) or perform a double ADMM. In this paper, we revisit the GAMP algorithm (as e.g. for sparse Bayesian learning (SBL)) by more rigorously applying an alternating constrained minimization strategy to an appropriately reparameterized LSL BFE. This guarantees convergence, at least to a local optimum. We furthermore introduce a natural extension of the BFE to integrate the estimation of (the SBL) hyperparameters via Variational Bayes, leading to Variational AMBGAMP or VAM-BGAMP." @default.
• W4372267286 created "2023-05-07" @default.
• W4372267286 creator A5014663629 @default.
• W4372267286 creator A5030833379 @default.
• W4372267286 date "2023-06-04" @default.
• W4372267286 modified "2023-09-27" @default.
• W4372267286 title "Alternating Constrained Minimization Based Approximate Message Passing" @default.
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• W4372267286 doi "https://doi.org/10.1109/icassp49357.2023.10094948" @default.
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