A novel dual-scale ensemble learning paradigm with error correction for predicting daily ozone concentration based on multi-decomposition process and intelligent algorithm optimization, and its application in heavily polluted regions of China

2021 ◽  
pp. 101306
Author(s):  
Jianguo Zhou ◽  
Zhongtian Xu ◽  
Shiguo Wang
2018 ◽  
Vol 201 ◽  
pp. 34-45 ◽  
Author(s):  
Hongyuan Luo ◽  
Deyun Wang ◽  
Chenqiang Yue ◽  
Yanling Liu ◽  
Haixiang Guo

2012 ◽  
Vol 93 ◽  
pp. 432-443 ◽  
Author(s):  
Ling Tang ◽  
Lean Yu ◽  
Shuai Wang ◽  
Jianping Li ◽  
Shouyang Wang

Author(s):  
Lean Yu ◽  
Shouyang Wang

In this study, a multistage confidence-based radial basis function (RBF) neural network ensemble learning model is proposed to design a reliable delinquent prediction system for credit risk management. In the first stage, a bagging sampling approach is used to generate different training datasets. In the second stage, the RBF neural network models are trained using various training datasets from the previous stage. In the third stage, the trained RBF neural network models are applied to the testing dataset and some prediction results and confidence values can be obtained. In the fourth stage, the confidence values are scaled into a unit interval by logistic transformation. In the final stage, the multiple different RBF neural network models are fused to obtain the final prediction results by means of confidence measure. For illustration purpose, two publicly available credit datasets are used to verify the effectiveness of the proposed confidence-based RBF neural network ensemble learning paradigm.


2008 ◽  
Vol 30 (5) ◽  
pp. 2623-2635 ◽  
Author(s):  
Lean Yu ◽  
Shouyang Wang ◽  
Kin Keung Lai

2017 ◽  
Vol 18 (7) ◽  
pp. 1002-1020 ◽  
Author(s):  
Jin Zhang ◽  
Zhao-hui Tang ◽  
Wei-hua Gui ◽  
Qing Chen ◽  
Jin-ping Liu

Author(s):  
Hengliang Guo ◽  
Yanling Guo ◽  
Wenyu Zhang ◽  
Xiaohui He ◽  
Zongxi Qu

The non-stationarity, nonlinearity and complexity of the PM2.5 series have caused difficulties in PM2.5 prediction. To improve prediction accuracy, many forecasting methods have been developed. However, these methods usually do not consider the importance of data preprocessing and have limitations only using a single forecasting model. Therefore, this paper proposed a new hybrid decomposition–ensemble learning paradigm based on variation mode decomposition (VMD) and improved whale-optimization algorithm (IWOA) to address complex nonlinear environmental data. First, the VMD is employed to decompose the PM2.5 sequences into a set of variational modes (VMs) with different frequencies. Then, an ensemble method based on four individual forecasting approaches is applied to forecast all the VMs. With regard to ensemble weight coefficients, the IWOA is applied to optimize the weight coefficients, and the final forecasting results were obtained by reconstructing the refined sequences. To verify and validate the proposed learning paradigm, four daily PM2.5 datasets collected from the Jing-Jin-Ji area of China are chosen as the test cases to conduct the empirical research. The experimental results indicated that the proposed learning paradigm has the best results in all cases and metrics.


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