Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/3827
Title: A coupled indian buffet process model for collaborative filtering
Authors: Chatzis, Sotirios P. 
Keywords: Bayesian nonparametrics
Collaborative filtering systems
Computer science research
Digital contents
Factor analysis model
Indian buffet process
Novel methodology
State-of-the-art approach
Digital storage
Factor analysis
Learning systems
Collaborative filtering
Issue Date: 2012
Publisher: JMLR
Source: Journal of Machine Learning Research, 2012, Volume 25, Pages 65-79
Abstract: The dramatic rates new digital content becomes available has brought collaborative filtering systems in the epicenter of computer science research in the last decade. In this paper, we propose a novel methodology for rating prediction utilizing concepts from the field of Bayesian nonparametrics. The basic concept that underlies our approach is that each user rates a presented item based on the latent genres of the item and the latent interests of the user. Each item may belong to more than one genre, and each user may belong to more than one latent interest class. The number of existing latent genres and interests are not known beforehand, but should be inferred in a data-driven fashion. We devise a novel hierarchical factor analysis model to formulate our approach under these assumptions. We impose suitable priors over the allocation of items into genres, and users into interests, specifically, we utilize a novel scheme which comprises two coupled Indian buffet process priors that allow the number of latent classes (genres/interests) to be automatically inferred. We experiment on a large set of real ratings data, and show that our approach outperforms four common baselines, including two very competitive state-of-the-art approaches.
URI: http://ktisis.cut.ac.cy/jspui/handle/10488/3827
ISSN: 15324435
Rights: © 2012 S.P. Chatzi
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