Abstract
Modeling user behavior and latent preference implied in rating data are the basis of personalized information services. In this paper, we adopt a latent variable to describe user preference and Bayesian network (BN) with a latent variable as the framework for representing the relationships among the observed and the latent variables, and define user preference BN (abbreviated as UPBN). To construct UPBN effectively, we first give the property and initial structure constraint that enable conditional probability distributions (CPDs) related to the latent variable to fit the given data set by the Expectation-Maximization (EM) algorithm. Then, we give the EM-based algorithm for constraint-based maximum likelihood estimation of parameters to learn UPBN’s CPDs from the incomplete data w.r.t. the latent variable. Following, we give the algorithm to learn the UPBN’s graphical structure by applying the structural EM (SEM) algorithm and the Bayesian Information Criteria (BIC). Experimental results show the effectiveness and efficiency of our method.
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Acknowledgements
This paper was supported by the National Natural Science Foundation of China (Nos. 61472345, 61562090, 61462056, 61402398), Natural Science Foundation of Yunnan Province (Nos. 2014FA023, 2013FB009, 2013FB010), Program for Innovative Research Team in Yunnan University (No. XT412011), and Program for Excellent Young Talents of Yunnan University (No. XT412003).
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Gao, R., Yue, K., Wu, H., Zhang, B., Fu, X. (2016). Modeling User Preference from Rating Data Based on the Bayesian Network with a Latent Variable. In: Song, S., Tong, Y. (eds) Web-Age Information Management. WAIM 2016. Lecture Notes in Computer Science(), vol 9998. Springer, Cham. https://doi.org/10.1007/978-3-319-47121-1_1
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