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A Posterior-Neighborhood-Regularized Latent Factor Model for Highly Accurate Web Service QoS Prediction
Wu, Di1,2,3; He, Qiang6; Luo, Xin1,2,4,5; Shang, Mingsheng1,2; He, Yi7; Wang, Guoyin1,2
2022-03-01
摘要Neighborhood regularization is highly important for a latent factor (LF)-based Quality-of-Service (QoS)-predictor since similar users usually experience similar QoS when invoking similar services. Current neighborhood-regularized LF models rely prior information on neighborhood obtained from common raw QoS data or geographical information. The former suffers from low prediction accuracy due to the difficulty of constructing the neighborhood based on incomplete QoS data, while the latter requires additional geographical information that is usually difficult to collect considering information security, identity privacy, and commercial interests in real-world scenarios. To address the above issues, this work proposes a posterior-neighborhood-regularized LF (PLF) model for QoS prediction. The main idea is to decompose the LF analysis process into three phases: a) primal LF extraction, where the LFs are extracted to represent involved users/services based on known QoS data, b) posterior-neighborhood construction, where the neighborhood of each user/service is achieved based on similarities between their primal LF vectors, and c) posterior-neighborhood-regularized LF analysis, where the objective function is regularized by both the posterior-neighborhood of users/services and L-2-norm of desired LFs. Experimental results from large scale QoS datasets demonstrate that PLF outperforms state-of-the-art models in terms of both accuracy and efficiency.
关键词Web service quality-of-service latent factor analysis posterior-neighborhood regularization cloud computing big data
DOI10.1109/TSC.2019.2961895
发表期刊IEEE TRANSACTIONS ON SERVICES COMPUTING
ISSN1939-1374
卷号15期号:2页码:793-805
通讯作者Luo, Xin(luoxin21@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:000779610600017
语种英语