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arXiv 2108.00237math.OC
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利用有效集非单调投影梯度的l1-ball上的极小化

Minimization over the l1-ball using an active-set non-monotone projected gradient

Andrea Cristofari, Marianna De Santis, Stefano Lucidi, Francesco Rinaldi

摘要:

l1球是一个结构良好的可行集,广泛应用于许多领域(例如,机器学习、统计学和信号分析)以在模型解决方案中实施一些稀疏性。在本文中,我们设计了一个有效的策略,有效地处理最小化问题的l1球,并将其嵌入到一个定制的算法计划,利用非单调的一阶方法,探索在每次迭代的给定子空间。证明了算法的整体收敛到平稳点。最后,我们报告的数值实验,两个不同类别的实例,显示算法的有效性。

英文摘要:

The l1-ball is a nicely structured feasible set that is widely used in many fields (e.g., machine learning, statistics and signal analysis) to enforce some sparsity in the model solutions. In this paper, we devise an active-set strategy for efficiently dealing with minimization problems over the l1-ball and embed it into a tailored algorithmic scheme that makes use of a non-monotone first-order approach to explore the given subspace at each iteration. We prove global convergence to stationary points. Finally, we report numerical experiments, on two different classes of instances, showing the effectiveness of the algorithm.

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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