A new adaptive framework for collaborative filtering prediction

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A new adaptive framework for collaborative filtering prediction

Please use this identifier to cite or link to this item: http://hdl.handle.net/10355/5630

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Title: A new adaptive framework for collaborative filtering prediction
Author: Almosallam, Ibrahim Ahmad
Date: 2008
Publisher: University of Missouri--Columbia
Abstract: Collaborative filtering is one of the most successful techniques for recommendation systems and has been used in many commercial services provided by major companies including Amazon, TiVo and Netflix. In this project we focus on memory-based collaborative filtering (CF). Existing CF techniques work well on dense data but poorly on sparse data. To address this weakness, we propose to use z-scores instead of explicit ratings and introduce a mechanism that adaptively combines global statistics with item-based values based on data density level. A new adaptive framework that encapsulates various CF algorithms and the relationships among them is presented. An adaptive CF predictor is developed that can self adapt from user-based to item-based to hybrid methods based on the amount of available ratings. The experimental results show that the new predictor consistently obtained more accurate predictions than existing CF methods, with the most significant improvement on sparse data sets. When applied to the Netflix Challenge data set, the method performed better than existing CF and singular value decomposition (SVD) methods and achieved 4.67% improvement over Netflix's system.
URI: http://hdl.handle.net/10355/5630
Other Identifiers: AlmosallamI-060608-T10388

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