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Technol."],"published-print":{"date-parts":[[2017,1,31]]},"abstract":"<jats:p>\n            Location-based social networks (LBSNs), such as Gowalla, Facebook, Foursquare, Brightkite, and so on, have attracted millions of users to share their social friendship and their locations via check-ins in the past few years. Plenty of valuable information is accumulated based on the check-in behaviors, which makes it possible to learn users\u2019 moving patterns as well as their preferences. In LBSNs, point-of-interest (POI) recommendation is one of the most significant tasks because it can help targeted users explore their surroundings as well as help third-party developers provide personalized services. Matrix factorization is a promising method for this task because it can capture users\u2019 preferences to locations and is widely adopted in traditional recommender systems such as movie recommendation. However, the sparsity of the check-in data makes it difficult to capture users\u2019 preferences accurately. Geographical influence can help alleviate this problem and have a large impact on the final recommendation result. By studying users\u2019 moving patterns, we find that users tend to check in around several centers and different users have different numbers of centers. Based on this, we propose a Multi-center Gaussian Model (MGM) to capture this pattern via modeling the probability of a user\u2019s check-in on a location. Moreover, users are usually more interested in the top 20 or even top 10 recommended POIs, which makes personalized ranking important in this task. From previous work, directly optimizing for pairwise ranking like Bayesian Personalized Ranking (BPR) achieves better performance in the top-\n            <jats:italic>k<\/jats:italic>\n            recommendation than directly using matrix matrix factorization that aims to minimize the point-wise rating error. To consider users\u2019 preferences, geographical influence and personalized ranking, we propose a unified POI recommendation framework, which unifies all of them together. Specifically, we first fuse MGM with matrix factorization methods and further with BPR using two different approaches. We conduct experiments on Gowalla and Foursquare datasets, which are two large-scale real-world LBSN datasets publicly available online. The results on both datasets show that our unified POI recommendation framework can produce better performance.\n          <\/jats:p>","DOI":"10.1145\/2901299","type":"journal-article","created":{"date-parts":[[2016,9,21]],"date-time":"2016-09-21T12:42:46Z","timestamp":1474461766000},"page":"1-21","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":38,"title":["A Unified Point-of-Interest Recommendation Framework in Location-Based Social Networks"],"prefix":"10.1145","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7319-5302","authenticated-orcid":false,"given":"Chen","family":"Cheng","sequence":"first","affiliation":[{"name":"The Chinese University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Haiqin","family":"Yang","sequence":"additional","affiliation":[{"name":"The Chinese University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Irwin","family":"King","sequence":"additional","affiliation":[{"name":"The Chinese University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael R.","family":"Lyu","sequence":"additional","affiliation":[{"name":"The Chinese University of Hong Kong, Hong Kong"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2016,9,20]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/2124295.2124314"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/1345448.1345465"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/1281192.1281206"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.14778\/1920841.1920968"},{"key":"e_1_2_1_5_1","unstructured":"Ye Chen Michael Kapralov Dmitry Pavlov and John Canny. 2009. 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