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arXiv 2402.15944cs.ITeess.SPmath.IT
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关于一类贪心稀疏恢复算法的类

On A Class of Greedy Sparse Recovery Algorithms

Zhejiang University of Science & Technology(浙江科技学院);DAMO Academy, Alibaba Group US(阿里巴巴集团美国达摩院);Iowa State University(爱荷华州立大学);Rice University(莱斯大学)

Gang Li, Qiuwei Li, Shuang Li, Wu Angela Li

AI总结:

本文提出了一种新的贪心方法,通过在稀疏空间中直接利用给定测度来解决稀疏信号恢复问题,提出的算法在恢复精度上优于传统OMP和BP算法。

摘要:

稀疏信号恢复旨在寻找欠定线性系统$\vx = \mQ\vs$的最稀疏解。本文提出了一种新的贪心方法,基于对系统解的刻画,允许在$\vs$-空间中直接进行稀疏恢复。使用$l_2$-基测度,提出了一种正交匹配追踪(OMP)-型算法,其在恢复精度上显著优于传统OMP算法,同时保持计算复杂度相当。推导出基于$l_1$的算法$\text{Alg}_{GL1}$,其在恢复精度上显著优于传统基追踪(BP)算法。结合CoSaMP策略选择原子,还推导出一类高性能贪心算法。在合成和图像数据上进行了大量数值模拟,证明了所提算法在稀疏恢复精度和系统矩阵$\mQ$的数值不稳定性及测量扰动方面的鲁棒性。

英文摘要:

Sparse signal recovery deals with finding the sparsest solution of an under-determined linear system $\vx = \mQ\vs$. In this paper, we propose a novel greedy approach to addressing the challenges from such a problem. Such an approach is based on a characterization of solutions to the system, which allows us to work on the sparse recovery in the $\vs$-space directly with a given measure. With $l_2$-based measure, an orthogonal matching pursuit (OMP)-type algorithm is proposed, which significantly outperforms the classical OMP algorithm in terms of recovery accuracy while maintaining comparable computational complexity. An $l_1$-based algorithm, denoted as $\text{Alg}_{GL1}$, is derived. Such an algorithm significantly outperforms the classical basis pursuit (BP) algorithm. Combining with the CoSaMP-strategy for selecting atoms, a class of high performance greedy algorithms is also derived. Extensive numerical simulations on both synthetic and image data are carried out, with which the superior performance of our proposed algorithms is demonstrated in terms of sparse recovery accuracy and robustness against numerical instability of the system matrix $\mQ$ and disturbance in the measurement $\vx$.

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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