Affiliation:
1. Key Laboratory of Intelligent Perception and Image Understanding of Ministry of Education of China, School of Computer Science and Technology, Xidian University, No. 2 South TaiBai Road, Xi’an 710071, China
2. School of Artificial Intelligence, Xidian University, No. 2 South TaiBai Road, Xi’an 710071, China
Abstract
Deep learning (DL) algorithms have demonstrated important breakthroughs for hyperspectral image (HSI) classification. Despite the remarkable success of DL, the burden of a manually designed DL structure with increased depth and size aroused the difficulty for the application in the mobile and embedded devices in a real application. To tackle this issue, in this paper, we proposed an efficient lightweight attention network architecture search algorithm (EL-NAS) for realizing an efficient automatic design of a lightweight DL structure as well as improving the classification performance of HSI. First, aimed at realizing an efficient search procedure, we construct EL-NAS based on a differentiable network architecture search (NAS), which can greatly accelerate the convergence of the over-parameter supernet in a gradient descent manner. Second, in order to realize lightweight search results with high accuracy, a lightweight attention module search space is designed for EL-NAS. Finally, further for alleviating the problem of higher validation accuracy and worse classification performance, the edge decision strategy is exploited to perform edge decisions through the entropy of distribution estimated over non-skip operations to avoid further performance collapse caused by numerous skip operations. To verify the effectiveness of EL-NAS, we conducted experiments on several real-world hyperspectral images. The results demonstrate that the proposed EL-NAS indicates a more efficient search procedure with smaller parameter sizes and high accuracy performance for HSI classification, even under data-independent and sensor-independent scenarios.
Funder
GHfund B
National Natural Science Foundation of China
China Postdoctoral Science Foundation funded project
China Aerospace Science and Technology Corporation Joint Laboratory for Innovative Onboard Computer and Electronic Technologies
Subject
General Earth and Planetary Sciences
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