A Review of Gray Sheep Users Problem in Collaborating Filtering

The existence of online markets has had a profound impact on customers’ habit. Although it has eased the accessibility of markets, wide variety of products have beenbewildered for customers to find what exact thing they want. One of the main solutions proposed for overloaded information is recommender systems (RSs)[34].Recommender systems have become very popular in recent years and have been being used in large number of web applications[4]. They are software’s that the aim of them is to recommend the most suitable items to the active user by using the interactions that every user has with the items.