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Joint User Modeling across Aligned Heterogeneous Sites

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Published:07 September 2016Publication History

ABSTRACT

An accurate and comprehensive user modeling technique is crucial for the quality of recommender systems. Traditionally, we model user preferences using only actions from the target site and may suffer from cold-start problem. As nowadays people normally engage in multiple online sites for various needs, we consider leveraging the cross-site actions to improve the user modeling accuracy. Specifically, in this paper we aim at achieving a more comprehensive and accurate user modeling by modeling user's actions in multiple aligned heterogeneous sites simultaneously. To do so, we propose a modularized probabilistic graphical model framework JUMA. We further integrate topic model and matrix factorization into JUMA for joint user modeling over text-based and item-based sites. We assemble and publish large-scale dataset for comprehensive analyzing and evaluation. Experimental results show that our framework JUMA out performs traditional within-site user modeling techniques, especially for cold-start scenarios. For cold-start users, we achieve relative improvements of 9.3% and 12.8% comparing to existing within-site approaches for recommendation in item-based and text-based sites respectively. Thus we draw the conclusion that aligning heterogeneous sites and modeling users jointly do help to improve the quality of online recommender systems.

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          cover image ACM Conferences
          RecSys '16: Proceedings of the 10th ACM Conference on Recommender Systems
          September 2016
          490 pages
          ISBN:9781450340359
          DOI:10.1145/2959100

          Copyright © 2016 ACM

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          Publication History

          • Published: 7 September 2016

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          RecSys '16 Paper Acceptance Rate29of159submissions,18%Overall Acceptance Rate254of1,295submissions,20%

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