{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,11]],"date-time":"2025-09-11T19:09:35Z","timestamp":1757617775186,"version":"3.44.0"},"publisher-location":"New York, NY, USA","reference-count":19,"publisher":"ACM","content-domain":{"domain":["dl.acm.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2025,9,22]]},"DOI":"10.1145\/3705328.3759321","type":"proceedings-article","created":{"date-parts":[[2025,9,6]],"date-time":"2025-09-06T10:48:44Z","timestamp":1757155724000},"page":"1311-1316","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["The Hidden Cost of Defaults in Recommender System Evaluation"],"prefix":"10.1145","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-9633-1048","authenticated-orcid":false,"given":"Hannah","family":"Berling","sequence":"first","affiliation":[{"name":"University of Gothenburg, Gothenburg, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-9143-8255","authenticated-orcid":false,"given":"Robin","family":"Svahn","sequence":"additional","affiliation":[{"name":"University of Gothenburg, Gothenburg, Sweden"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2929-0529","authenticated-orcid":false,"given":"Alan","family":"Said","sequence":"additional","affiliation":[{"name":"University of Gothenburg, Gothenburg, Sweden"}]}],"member":"320","published-online":{"date-parts":[[2025,9,7]]},"reference":[{"key":"e_1_3_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1145\/3404835.3463245"},{"key":"e_1_3_3_2_3_2","doi-asserted-by":"publisher","unstructured":"Christine Bauer Eva Zangerle and Alan Said. 2024. Exploring the Landscape of Recommender Systems Evaluation: Practices and Perspectives. ACM Trans. Recomm. Syst. 2 1 (March 2024) 11:1\u201311:31. 10.1145\/3629170","DOI":"10.1145\/3629170"},{"key":"e_1_3_3_2_4_2","doi-asserted-by":"publisher","unstructured":"Daniel\u00a0Mesafint Belete and Manjaiah\u00a0D. Huchaiah. 2022. Grid search in hyperparameter optimization of machine learning models for prediction of HIV\/AIDS test results. International Journal of Computers and Applications 44 9 (Sept. 2022) 875\u2013886. 10.1080\/1206212X.2021.1974663","DOI":"10.1080\/1206212X.2021.1974663"},{"key":"e_1_3_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.5555\/2986459.2986743"},{"key":"e_1_3_3_2_6_2","first-page":"115","volume-title":"Proceedings of the 30th International Conference on Machine Learning","author":"Bergstra James","year":"2013","unstructured":"James Bergstra, Daniel Yamins, and David Cox. 2013. Making a Science of Model Search: Hyperparameter Optimization in Hundreds of Dimensions for Vision Architectures. In Proceedings of the 30th International Conference on Machine Learning. PMLR, Atlanta, Georgia, USA, 115\u2013123. https:\/\/proceedings.mlr.press\/v28\/bergstra13.html ISSN: 1938-7228."},{"key":"e_1_3_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1145\/3298689.3347058"},{"key":"e_1_3_3_2_8_2","doi-asserted-by":"publisher","unstructured":"Mukund Deshpande and George Karypis. 2004. Item-based top-N recommendation algorithms. ACM Trans. Inf. Syst. 22 1 (Jan. 2004) 143\u2013177. 10.1145\/963770.963776","DOI":"10.1145\/963770.963776"},{"key":"e_1_3_3_2_9_2","doi-asserted-by":"publisher","unstructured":"Maurizio Ferrari\u00a0Dacrema Simone Boglio Paolo Cremonesi and Dietmar Jannach. 2021. A Troubling Analysis of Reproducibility and Progress in Recommender Systems Research. ACM Trans. Inf. Syst. 39 2 (Jan. 2021) 20:1\u201320:49. 10.1145\/3434185","DOI":"10.1145\/3434185"},{"key":"e_1_3_3_2_10_2","doi-asserted-by":"publisher","unstructured":"F.\u00a0Maxwell Harper and Joseph\u00a0A. Konstan. 2015. The MovieLens Datasets: History and Context. ACM Trans. Interact. Intell. Syst. 5 4 (Dec. 2015) 19:1\u201319:19. 10.1145\/2827872","DOI":"10.1145\/2827872"},{"key":"e_1_3_3_2_11_2","doi-asserted-by":"publisher","DOI":"10.1145\/3038912.3052569"},{"key":"e_1_3_3_2_12_2","doi-asserted-by":"publisher","DOI":"10.1145\/3178876.3186150"},{"key":"e_1_3_3_2_13_2","doi-asserted-by":"publisher","DOI":"10.1109\/ICDM.2012.110"},{"key":"e_1_3_3_2_14_2","doi-asserted-by":"publisher","DOI":"10.1145\/3523227.3551472"},{"key":"e_1_3_3_2_15_2","doi-asserted-by":"publisher","DOI":"10.1145\/2645710.2645746"},{"key":"e_1_3_3_2_16_2","doi-asserted-by":"publisher","DOI":"10.1145\/3604915.3609488"},{"key":"e_1_3_3_2_17_2","doi-asserted-by":"publisher","DOI":"10.1145\/3336191.3371831"},{"key":"e_1_3_3_2_18_2","doi-asserted-by":"publisher","DOI":"10.1145\/3308558.3313710"},{"key":"e_1_3_3_2_19_2","doi-asserted-by":"publisher","DOI":"10.1145\/3404835.3462862"},{"key":"e_1_3_3_2_20_2","doi-asserted-by":"publisher","DOI":"10.1145\/3459637.3482016"}],"event":{"name":"RecSys '25: Nineteenth ACM Conference on Recommender Systems","sponsor":["SIGCHI ACM Special Interest Group on Computer-Human Interaction","SIGAI ACM Special Interest Group on Artificial Intelligence","SIGIR ACM Special Interest Group on Information Retrieval","SIGKDD ACM Special Interest Group on Knowledge Discovery in Data","SIGWEB ACM Special Interest Group on Hypertext, Hypermedia, and Web"],"location":"Prague Czech Republic","acronym":"RecSys '25"},"container-title":["Proceedings of the Nineteenth ACM Conference on Recommender Systems"],"original-title":[],"link":[{"URL":"https:\/\/dl.acm.org\/doi\/pdf\/10.1145\/3705328.3759321","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,9,6]],"date-time":"2025-09-06T11:44:49Z","timestamp":1757159089000},"score":1,"resource":{"primary":{"URL":"https:\/\/dl.acm.org\/doi\/10.1145\/3705328.3759321"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,9,7]]},"references-count":19,"alternative-id":["10.1145\/3705328.3759321","10.1145\/3705328"],"URL":"https:\/\/doi.org\/10.1145\/3705328.3759321","relation":{},"subject":[],"published":{"date-parts":[[2025,9,7]]},"assertion":[{"value":"2025-09-07","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}