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Choosing among so many options is challenging for users. As such, helping users easily find their desirable groups has become increasingly important. In this paper, we provide a systematic experimental evaluation of several collaborative filtering algorithms to recommend groups for Flickr users. In particular, we design and compare seven Flickr group recommendation models: three memory-based models and four model-based models. Our results suggest that model-based approaches are beneficial compared with memory-based approaches in terms of top- krecommendation metric. Models with tags perform well for sparse data, whereas models without tags are more suitable for dense data. Furthermore, incorporating tags in the recommendation algorithms leads to an improvement of precision on the top 2% performance. <\/jats:p>","DOI":"10.1177\/0165551510386164","type":"journal-article","created":{"date-parts":[[2010,11,6]],"date-time":"2010-11-06T00:52:22Z","timestamp":1289004742000},"page":"733-750","source":"Crossref","is-referenced-by-count":43,"title":["Which photo groups should I choose? A comparative study of recommendation algorithms in Flickr"],"prefix":"10.1177","volume":"36","author":[{"family":"Nan Zheng","sequence":"first","affiliation":[{"name":"Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, P. R. China"}]},{"family":"Qiudan Li","sequence":"additional","affiliation":[{"name":"Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, P. R. China,"}]},{"family":"Shengcai Liao","sequence":"additional","affiliation":[{"name":"Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, P. R. 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