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arXiv 2401.02544cs.LGstat.CO
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Sparse Bayesian Learning模型的超参数估计

Hyperparameter Estimation for Sparse Bayesian Learning Models

University of Minnesota(明尼苏达大学);Syracuse University(雪城大学);Old Dominion University(欧道明大学)

Feng Yu, Lixin Shen, Guohui Song

AI总结:

针对SBL模型超参数估计的非凸与高维难题,提出基于AML范式的综合框架及含近端正则化的AMQ新范式,新算法在低信噪比下效率显著提升。

摘要:

Sparse Bayesian Learning (SBL)模型在信号处理和机器学习中被广泛用于通过分层先验促进稀疏性。SBL模型中的超参数对模型性能至关重要,但由于相关目标函数的非凸性和高维性,它们通常难以估计。本文提出了一个用于SBL模型超参数估计的综合框架,包含期望最大化(EM)、MacKay和凸边界(CB)等知名算法。这些算法在交替最小化与线性化(AML)范式内得到了统一解释,其区别在于各自独特的线性化代理函数。此外,在AML框架内引入了一种新算法,显示出更高的效率,特别是在低信噪比下。这通过一种包含近端正则化项的全新交替最小化与二次近似(AMQ)范式得到了进一步改进。本文通过详尽的收敛分析和数值实验证实了这些进展,证明了该算法在各种噪声条件和信噪比下的有效性。

英文摘要:

Sparse Bayesian Learning (SBL) models are extensively used in signal processing and machine learning for promoting sparsity through hierarchical priors. The hyperparameters in SBL models are crucial for the model's performance, but they are often difficult to estimate due to the non-convexity and the high-dimensionality of the associated objective function. This paper presents a comprehensive framework for hyperparameter estimation in SBL models, encompassing well-known algorithms such as the expectation-maximization (EM), MacKay, and convex bounding (CB) algorithms. These algorithms are cohesively interpreted within an alternating minimization and linearization (AML) paradigm, distinguished by their unique linearized surrogate functions. Additionally, a novel algorithm within the AML framework is introduced, showing enhanced efficiency, especially under low signal noise ratios. This is further improved by a new alternating minimization and quadratic approximation (AMQ) paradigm, which includes a proximal regularization term. The paper substantiates these advancements with thorough convergence analysis and numerical experiments, demonstrating the algorithm's effectiveness in various noise conditions and signal-to-noise ratios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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