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This is also a very important problem that all recommender systems are facing nowadays. It happens when user has large history list. The list contains everything like list of items he bought or list of movies he watched or listed of music he listened and even his previous surfing list. Sparsity happens when the user does not give rating after buying items or after watching movies. Rating is the most fundamental element for a MCRS. Because of lack of rating, a recommender system does not able to understand that whether the client liked that particular thing or not [34].