FairMatch: A Graph-based Approach for Improving Aggregate Diversity in Recommender Systems

Masoud Mansoury, Himan Abdollahpouri, Mykola Pechenizkiy, Bamshad Mobasher, Robin Burke

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

13 Citations (Scopus)

Abstract

Recommender systems are often biased toward popular items. In other words, few items are frequently recommended while the majority of items do not get proportionate attention. That leads to low coverage of items in recommendation lists across users (i.e. low aggregate diversity) and unfair distribution of recommended items. In this paper, we introduce FairMatch, a general graph-based algorithm that works as a post-processing approach after recommendation generation for improving aggregate diversity. The algorithm iteratively finds items that are rarely recommended yet are high-quality and add them to the users' final recommendation lists. This is done by solving the maximum flow problem on the recommendation bipartite graph. While we focus on aggregate diversity and fair distribution of recommended items, the algorithm can be adapted to other recommendation scenarios using different underlying definitions of fairness. A comprehensive set of experiments on two datasets and comparison with state-of-the-art baselines show that FairMatch, while significantly improving aggregate diversity, provides comparable recommendation accuracy.

Original languageEnglish
Title of host publicationUMAP 2020 - Proceedings of the 28th ACM Conference on User Modeling, Adaptation and Personalization
PublisherAssociation for Computing Machinery, Inc
Pages154-162
Number of pages9
ISBN (Electronic)9781450368612
DOIs
Publication statusPublished - 7 Jul 2020
Event28th International Conference on User Modeling, Adaptation and Personalization, UMAP 2020 - Virtual, Genoa, Italy
Duration: 12 Jul 202018 Jul 2020
Conference number: 28

Conference

Conference28th International Conference on User Modeling, Adaptation and Personalization, UMAP 2020
Abbreviated titleUMAP 2020
Country/TerritoryItaly
CityGenoa
Period12/07/2018/07/20

Keywords

  • aggregate diversity
  • fairness
  • long-tail
  • popularity bias
  • recommendation coverage
  • recommender systems

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