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recsys evaluation recommender systems knn recsys2011 collaborative-filtering performance prediction similarity probabilistic recsys2013 recommender reproducibility trec2013 recsys2014 clustering recsys2012 error recsys2017 precision phd overlap oair2013 poster-slam popularity spotify bitly music lastfm poster misinformation recsys2020 nearest-neighbor temporal confidence replication recsys2015 evaltutorial implicit social network trust matrix factorization toolkit ht2014 replicability clueweb12 contextual suggestion cwi federated web relevance models relevance models relevance models ictir ictir