Abstract
The least absolute shrinkage and selection operator (LASSO) and its variants are widely used for sparse signal recovery. However, the determination of the regularization factor requires cross-validation strategy, which may obtain a sub-optimal solution. Motivated by the self-regularization nature of sparse Bayesian learning (SBL) approach and the framework of generalized LASSO, we propose a new hierarchical Bayesian model using automatic-weighting Laplace priors in this paper. In the proposed hierarchical Bayesian model, the posterior distributions of all the parameters can be approximated using variational Bayesian inference, resulting in closed-form solutions for all parameters updating. Moreover, the space alternating variational estimation strategy is used to avoid matrix inversion, and a fast algorithm (SAVE-WLap-SBL) is proposed. Comparing to existed SBL methods, the proposed method encourages the sparsity of signals more efficiently. Numerical experiments on synthetic and real data illustrate the benefit of these advances.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Notes
‘Under-sampled’ means that \(M<N\) in Eq. (1).
In this paper, the \(l_0\) norm is defined as the number of non-zero elements of signal \(\varvec{\beta }\).
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ZB conceptualized the study and run the experiments. JS edited the manuscript. All the authors read and approved the final manuscript.
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Bai, Z., Sun, J. Sparse Bayesian learning with automatic-weighting Laplace priors for sparse signal recovery. Comput Stat 38, 2053–2074 (2023). https://doi.org/10.1007/s00180-023-01354-4
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DOI: https://doi.org/10.1007/s00180-023-01354-4