Using Wikipedia to boost collaborative filtering techniques

Authors:
Gilad Katz;Nir Ofek;Bracha Shapira;Lior Rokach;Guy Shani
Affiliations:
Ben Gurion University, Beer Sheva, Israel;Ben Gurion University, Beer Sheva, Israel;Ben Gurion University, Beer Sheva, Israel;Ben Gurion University, Beer Sheva, Israel;Ben Gurion University, Beer Sheva, Israel
Venue:
Proceedings of the fifth ACM conference on Recommender systems
Year:
2011

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Abstract

One important challenge in the field of recommender systems is the sparsity of available data. This problem limits the ability of recommender systems to provide accurate predictions of user ratings. We overcome this problem by using the publicly available user generated information contained in Wikipedia. We identify similarities between items by mapping them to Wikipedia pages and finding similarities in the text and commonalities in the links and categories of each page. These similarities can be used in the recommendation process and improve ranking predictions. We find that this method is most effective in cases where ratings are extremely sparse or nonexistent. Preliminary experimental results on the MovieLens dataset are encouraging.