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Sparse Bayesian Lasso via a Variable-Coefficient $\ell_1$ Penalty. (arXiv:2211.05089v2 [stat.ME] UPDATED)
Nov. 15, 2022, 2:14 a.m. | Nathan Wycoff, Ali Arab, Katharine M. Donato, Lisa O. Singh
stat.ML updates on arXiv.org arxiv.org
Modern statistical learning algorithms are capable of amazing flexibility,
but struggle with interpretability. One possible solution is sparsity: making
inference such that many of the parameters are estimated as being identically
0, which may be imposed through the use of nonsmooth penalties such as the
$\ell_1$ penalty. However, the $\ell_1$ penalty introduces significant bias
when high sparsity is desired. In this article, we retain the $\ell_1$ penalty,
but define learnable penalty weights $\lambda_p$ endowed with hyperpriors. We
start the article …
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