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Serendipity in Recommender Systems: A Systematic Literature Review

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Abstract

A recommender system is employed to accurately recommend items, which are expected to attract the user’s attention. The over-emphasis on the accuracy of the recommendations can cause information over-specialization and make recommendations boring and even predictable. Novelty and diversity are two partly useful solutions to these problems. However, novel and diverse recommendations cannot merely ensure that users are attracted since such recommendations may not be relevant to the user’s interests. Hence, it is necessary to consider other criteria, such as unexpectedness and relevance. Serendipity is a criterion for making appealing and useful recommendations. The usefulness of serendipitous recommendations is the main superiority of this criterion over novelty and diversity. The bulk of studies of recommender systems have focused on serendipity in recent years. Thus, a systematic literature review is conducted in this paper on previous studies of serendipity-oriented recommender systems. Accordingly, this paper focuses on the contextual convergence of serendipity definitions, datasets, serendipitous recommendation methods, and their evaluation techniques. Finally, the trends and existing potentials of the serendipity-oriented recommender systems are discussed for future studies. The results of the systematic literature review present that the quality and the quantity of articles in the serendipity-oriented recommender systems are progressing.

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Authors and Affiliations

  1. Department of Computer Engineering, Central Tehran Branch, Islamic Azad University, Tehran, 1477893855, Iran

    Reza Jafari Ziarani & Reza Ravanmehr

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  1. Reza Jafari Ziarani
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  2. Reza Ravanmehr
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Correspondence to Reza Ravanmehr.

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Ziarani, R.J., Ravanmehr, R. Serendipity in Recommender Systems: A Systematic Literature Review. J. Comput. Sci. Technol. 36, 375–396 (2021). https://doi.org/10.1007/s11390-020-0135-9

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  • DOI: https://doi.org/10.1007/s11390-020-0135-9

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