Recommendations, Artificial Intelligence, Machine Learning, Recommender Systems, Data Science.
calculated by computing the weighted sum of the user ratings given by other users to an item i. The prediction Pu,i is given by: where Pᵤ,ᵢ is the prediction of an item; Rᵥ,ᵢ is the rating given by a user v to an item i; Cluster of items The algorithm finds the similarity between each item pair