Recommendation System, Recommender Systems, Machine Learning, Data Science, Big Data.
watched i, tᵤᵢ = 0.1 means that he watched only 10% of it, tᵤᵢ = 2 means that he watched it twice. Intuitively, a user is more likely to be interested into a movie they watched twice, rather than in a movie they never watched. We therefore define a confidence matrix cᵤᵢ and a rating matrix rᵤᵢ as