Collaborative filtering is the most widely used technology in recommender systems. Researchers have done a lot of work on how to improve the collaborative filtering technology. However, there are few summaries about collaborative filtering technology which is reviewed in this paper. First of all, the different methods of collaborative filtering technology are studied and analyzed. Secondly, we compare the advantages and disadvantages of different methods. Then, the problems about collaborative filtering algorithm are proposed. Finally, the recommendation algorithms are summarized and some work will be done.
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