Article
| Title: | A tight bound of modified iterative hard thresholding algorithm for compressed sensing (English) |
| Author: | Ma, Jinyao |
| Author: | Zhang, Haibin |
| Author: | Yang, Shanshan |
| Author: | Jiang, Jiaojiao |
| Language: | English |
| Journal: | Applications of Mathematics |
| ISSN: | 0862-7940 (print) |
| ISSN: | 1572-9109 (online) |
| Volume: | 68 |
| Issue: | 5 |
| Year: | 2023 |
| Pages: | 623-642 |
| Summary lang: | English |
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| Category: | math |
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| Summary: | We provide a theoretical study of the iterative hard thresholding with partially known support set (IHT-PKS) algorithm when used to solve the compressed sensing recovery problem. Recent work has shown that IHT-PKS performs better than the traditional IHT in reconstructing sparse or compressible signals. However, less work has been done on analyzing the performance guarantees of IHT-PKS. In this paper, we improve the current RIP-based bound of IHT-PKS algorithm from $\delta _{3s-2k}<\smash {\frac {1}{\sqrt {32}}}\approx 0.1768$ to $\delta _{3s-2k}<\frac {\sqrt {5}-1}{4}\approx 0.309$, where $\delta _{3s-2k}$ is the restricted isometric constant of the measurement matrix. We also present the conditions for stable reconstruction using the ${\rm IHT}^{\mu }$-PKS algorithm which is a general form of IHT-PKS. We further apply the algorithm on Least Squares Support Vector Machines (LS-SVM), which is one of the most popular tools for regression and classification learning but confronts the loss of sparsity problem. After the sparse representation of LS-SVM is presented by compressed sensing, we exploit the support of bias term in the LS-SVM model with the ${\rm IHT}^{\mu }$-PKS algorithm. Experimental results on classification problems show that ${\rm IHT}^{\mu }$-PKS outperforms other approaches to computing the sparse LS-SVM classifier. (English) |
| Keyword: | iterative hard thresholding |
| Keyword: | signal reconstruction |
| Keyword: | classification problem |
| Keyword: | least squares support vector machine |
| MSC: | 34B16 |
| MSC: | 34C25 |
| MSC: | 90C31 |
| idZBL: | Zbl 07790538 |
| idMR: | MR4645001 |
| DOI: | 10.21136/AM.2023.0221-22 |
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| Date available: | 2023-10-05T15:12:03Z |
| Last updated: | 2024-12-13 |
| Stable URL: | http://hdl.handle.net/10338.dmlcz/151836 |
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