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Recommendation systems have been widely used in Ecommerce sites, social media and etc. An important recommendation task is to predict items that a user will perform actions on with users' historical data, which is called top-K recommendation. Recently, there is huge amount of emerging items which are divided into a variety of categories and researchers have argued or suggested that top-K recommendation of item category could be very beneficial for users to make better and faster decisions.doi:10.1587/transinf.2014edp7334 fatcat:ms3kldv6vjflfpvh5gb6i5mfpq