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Informatics 2018, 5(2), 21; https://doi.org/10.3390/informatics5020021

Exploiting Rating Abstention Intervals for Addressing Concept Drift in Social Network Recommender Systems

1
Department of Informatics and Telecommunications, University of Athens, 15784 Athens, Greece
2
Department of Informatics and Telecommunications, University of the Peloponnese, 22100 Tripolis, Greece
*
Author to whom correspondence should be addressed.
Received: 9 March 2018 / Revised: 21 April 2018 / Accepted: 23 April 2018 / Published: 26 April 2018
(This article belongs to the Special Issue Advances in Recommender Systems)
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Abstract

One of the major problems that social networks face is the continuous production of successful, user-targeted information in the form of recommendations, which are produced exploiting technology from the field of recommender systems. Recommender systems are based on information about users’ past behavior to formulate recommendations about their future actions. However, as time goes by, social network users may change preferences and likings: they may like different types of clothes, listen to different singers or even different genres of music and so on. This phenomenon has been termed as concept drift. In this paper: (1) we establish that when a social network user abstains from rating submission for a long time, it is a strong indication that concept drift has occurred and (2) we present a technique that exploits the abstention interval concept, to drop from the database ratings that do not reflect the current social network user’s interests, thus improving prediction quality. View Full-Text
Keywords: social networks; recommender systems; collaborative filtering; shift of interest; concept drift; evaluation social networks; recommender systems; collaborative filtering; shift of interest; concept drift; evaluation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Margaris, D.; Vassilakis, C. Exploiting Rating Abstention Intervals for Addressing Concept Drift in Social Network Recommender Systems. Informatics 2018, 5, 21.

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