上海科技大学知识管理系统

The use of appropriate abnormal data cleaning algorithms in the Internet of Things (IoT) can greatly improve data quality. Statistical methods or clustering methods are utilized to clean anomalies in Spatio-temporal data. However, these methods require additional prior knowledge, which will incur additional computational overhead for the sink node. In this paper, in line with the low-rank sparse matrix decomposition model, a fast anomaly cleaning algorithm based on a deep neural network is proposed to solve the Spatio-temporal data cleaning problem in IoT. Both the Spatio-temporal correlation of sensing data and the abnormal values' sparsity are considered in an optimization problem. The Iterative Shrinkage-Thresholding Algorithm (ISTA) is used to solve it. Then the ISTA is unfolded into a fixed-length deep neural network. The real-world dataset's experimental results show that the proposed method can automatically update the thresholds faster and more accurately than the traditional ISTA. © 2022, Science Press. All right reserved.