Applying Computational Intelligence Techniques to QoS Time Series Forecasting in Services Computing

Yang Syu; Yong-Yi FanJiang

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Applying Computational Intelligence Techniques to QoS Time Series Forecasting in Services Computing

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Recently, the forecasting of dynamic Quality of Service (QoS) values for Web Services (WSs) has become an emerging topic in services computing. In most previous research, various time series forecasting methods have been used to address this problem. In this paper, we propose the use of two computational intelligence techniques, namely, genetic programming (GP) and support vector regression (SVR). To demonstrate the forecasting performance of the two proposed techniques, we compare them with the conventional methods based on experiments run on a real-world dynamic QoS time series dataset. Our experimental results show that the proposed GP and SVR methods outperform the conventional methods in both training (in-sample) and testing (out-of-sample) accuracy. Between the two proposed approaches, we find that GP might be the better choice overall. In terms of training performance, GP is superior in terms of both the individual and average experimental results; however, this is not the case for testing performance. In terms of testing accuracy, SVR outperforms GP in many individual experiments; however, SVR also yields extremely poor forecasting accuracy in several individual experiments, indicating that it is unstable and unreliable. In many of the individual experiments, GP is only insignificantly inferior to SVR, and it still achieves the best average forecasting accuracy according to two of the three considered measures.

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来源
《Journal of Computers》 |2018年第9期|1010-1026|共17页
作者
Yang Syu; Yong-Yi FanJiang;
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作者单位

Department of Computer Science and Information Engineering, Fu Jen Catholic University, New Taipei City, Taiwan;

Institute of Information Science, Academia Sinica, Taipei City, Taiwan;

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正文语种英语
中图分类计量学;
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Time series forecasting; quality of service; computational intelligence techniques; support vector regression; genetic programming;

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Applying Computational Intelligence Techniques to QoS Time Series Forecasting in Services Computing

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