Recommendation System, Recommender Systems, Machine Learning, Data Science, Big Data.
rating matrix rᵤᵢ. For explicit feedback, each entry in rᵤᵢ is a numerical value—e.g. rᵤᵢ = “stars given by u to movie i”—or “?” if user u did not rate item i. For implicit feedback, the values in rᵤᵢ are a boolean values representing presence or lack of interaction—e.g. rᵤᵢ = “did user u watch