LiRa: A New Likelihood-Based Similarity Score for Collaborative Filtering
Veronika Strnadova-Neeley,
Aydin Buluc,
John R. Gilbert
et al.
Abstract:Recommender system data presents unique challenges to the data mining, machine learning, and algorithms communities. The high missing data rate, in combination with the large scale and high dimensionality typical of recommender systems data, requires new tools and methods for efficient data analysis. Here, we address the challenge of evaluating similarity between users in a recommender system, where for each user only a small set of ratings is available. We present a new similarity score, that we call LiRa, ba… Show more
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