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recommender systems recsys evaluation movie recommendation context awareness information retrieval user modeling magic barrier recsys2012 recommendation collaborative filtering iui2012 recommender system recsys2011 recsys2014 testing and evaluation cscw cscw2013 #recsys2014 acmsac2012 reproducibility carr2012 talis folksonomy replication human factors food recommendation context-awareness rival benchmarking context experimen-tation collaborative 铿乴tering recommenders ijcai2011 sna ijcai itwp2011 social network analysis social networks itwp recipe recommendation personalized food recommendation umap2014 coherence user-generated content health #lsrs2013 #recsys2013 #recsys umap2013 recsysberlin recsysmeetup recipes user study demographics umap2011 demo sigir 2012 data analysis umap2012 accuracy item weighting scheme similarity metrics cold start diversity popularity