YAMASHITA, AKIHIRO; KAWAMURA, HIDENORI; SUZUKI, KEIJI - In: Advances in Complex Systems (ACS) 14 (2011) 02, pp. 133-149
In many e-commerce sites, recommender systems, which provide personalized recommendations from among a large number of items, have recently been introduced. Collaborative filtering is one of the most successful algorithms which provide recommendations using ratings of users on items. There are...