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arXiv 2004.05132math.OC
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求解$\ell_0$ -正则化optimization的Newton方法

Newton method for $\ell_0$-regularized optimization

Shenglong Zhou, Lili Pan, Naihua Xiu

摘要:

正则化是稀疏优化中常用的一种方法。这导致了正则化优化,旨在最小化表征稀疏性的$\ell_0$范数或其连续代理。从代理的连续性到$\ell_0$范数的离散性,最具挑战性的模型是$\ell_0$ -正则化优化。为了克服这一困难,有大量的工作在发展数值有效的方法。然而,他们中的大多数人只享受要么(子)序列收敛到一个固定的点从确定性优化的角度来看,或之间的距离,每个子序列和任何给定的稀疏参考点是有界的误差界的概率意义上。在本文中,我们开发了一个牛顿型方法的$\ell_0$ -正则化优化,并证明了所产生的序列收敛到一个稳定点的标准假设下,全球和二次,从理论上解释,我们的方法是能够执行令人惊讶的好。

英文摘要:

As a tractable approach, regularization is frequently adopted in sparse optimization. This gives rise to the regularized optimization, aiming at minimizing the $\ell_0$ norm or its continuous surrogates that characterize the sparsity. From the continuity of surrogates to the discreteness of $\ell_0$ norm, the most challenging model is the $\ell_0$-regularized optimization. To conquer this hardness, there is a vast body of work on developing numerically effective methods. However, most of them only enjoy that either the (sub)sequence converges to a stationary point from the deterministic optimization perspective or the distance between each iterate and any given sparse reference point is bounded by an error bound in the sense of probability. In this paper, we develop a Newton-type method for the $\ell_0$-regularized optimization and prove that the generated sequence converges to a stationary point globally and quadratically under the standard assumptions, theoretically explaining that our method is able to perform surprisingly well.

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