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Item providers are key stakeholders in online platforms, and their earnings and plans are influenced by the exposure their items receive in recommended lists. Prior work showed that certain minority groups of providers, characterized by a common sensitive attribute (e.g., gender or race), are being disproportionately affected by indirect and unintentional discrimination. Our study in this paper handles a situation where (<jats:italic>i<\/jats:italic>) the same provider is associated with multiple items of a list suggested to a user, (<jats:italic>ii<\/jats:italic>) an item is created by more than one provider jointly, and (<jats:italic>iii<\/jats:italic>) predicted user\u2013item relevance scores are biasedly estimated for items of provider groups. Under this scenario, we assess disparities in relevance, visibility, and exposure, by simulating diverse representations of the minority group in the catalog and the interactions. Based on emerged unfair outcomes, we devise a treatment that combines observation upsampling and loss regularization, while learning user\u2013item relevance scores. Experiments on real-world data demonstrate that our treatment leads to lower disparate relevance. The resulting recommended lists show fairer visibility and exposure, higher minority item coverage, and negligible loss in recommendation utility.<\/jats:p>","DOI":"10.1007\/s11257-021-09294-8","type":"journal-article","created":{"date-parts":[[2021,8,5]],"date-time":"2021-08-05T19:02:46Z","timestamp":1628190166000},"page":"421-455","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":52,"title":["Interplay between upsampling and regularization for provider fairness in recommender systems"],"prefix":"10.1007","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6053-3015","authenticated-orcid":false,"given":"Ludovico","family":"Boratto","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4668-2476","authenticated-orcid":false,"given":"Gianni","family":"Fenu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1989-6057","authenticated-orcid":false,"given":"Mirko","family":"Marras","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,8,5]]},"reference":[{"key":"9294_CR1","doi-asserted-by":"publisher","unstructured":"Beutel, A., Chen, J., Doshi, T., Qian, H., Wei, L., Wu, Y., Heldt, L., Zhao, Z., Hong, L., Chi, E.H., Goodrow, C.: Fairness in recommendation ranking through pairwise comparisons. 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