Article: Improved user-based collaborative filtering algorithm with topic model and time tag Journal: International Journal of Computational Science and Engineering (IJCSE) 2020 Vol.22 No.2/3 pp.181 - 189 Abstract: Collaborative filtering algorithms make use of interaction rates between users and items for generating recommendations. Similarity among users is calculated based on rating mostly, without considering explicit properties of users involved. Considering the number of tags of a user can direct response the user preference to some extent, we propose a collaborative filtering algorithm using topic model called user-item-tag latent Dirichlet allocation (UITLDA) in this paper. UITLDA model consists of two parts. The first part is active user with its item. The second part is active user with its tag. We form topic model from these two parts respectively. The two topics constrain each other and integrate into a new topic distribution. This model not only increases the user's similarity, but also reduces the density of the matrix. In prediction computation, we also introduce time delay function to increase the precision. The experiments showed that the proposed algorithm achieved better performance compared with baseline on MovieLens datasets. Inderscience Publishers - linking academia, business and industry through research

Title: Improved user-based collaborative filtering algorithm with topic model and time tag

Authors: Liu Na; Lu Ying; Tang Xiao-Jun; Li Ming-Xia; Chunli Wang

Addresses: School of Information Science and Engineering, Dalian Polytechnic University, Dalian, China ' School of Information Science and Engineering, Dalian Polytechnic University, Dalian, China ' School of Information Science and Engineering, Dalian Polytechnic University, Dalian, China ' School of Information Science and Engineering, Dalian Polytechnic University, Dalian, China ' School of Information and Technology, Dalian Maritime University, Dalian, China

Abstract: Collaborative filtering algorithms make use of interaction rates between users and items for generating recommendations. Similarity among users is calculated based on rating mostly, without considering explicit properties of users involved. Considering the number of tags of a user can direct response the user preference to some extent, we propose a collaborative filtering algorithm using topic model called user-item-tag latent Dirichlet allocation (UITLDA) in this paper. UITLDA model consists of two parts. The first part is active user with its item. The second part is active user with its tag. We form topic model from these two parts respectively. The two topics constrain each other and integrate into a new topic distribution. This model not only increases the user's similarity, but also reduces the density of the matrix. In prediction computation, we also introduce time delay function to increase the precision. The experiments showed that the proposed algorithm achieved better performance compared with baseline on MovieLens datasets.

Keywords: collaborative filtering; LDA; topic model; time tag.

DOI: 10.1504/IJCSE.2020.10029349

International Journal of Computational Science and Engineering, 2020 Vol.22 No.2/3, pp.181 - 189

Received: 21 Jul 2017
Accepted: 09 Feb 2018
Published online: 18 May 2020 *

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Title: Improved user-based collaborative filtering algorithm with topic model and time tag

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