COMPSCI 753 Algorithms for Massive Data - Semester2 2021- Final Exam - Q4 Recommender Systems
A recommender system generates a ranked list of items for a specific user u as (p3, p10, p5, p7, p1, p9, p2, p4, p6, p8). The ranked list contains all items that haven’t been purchased by the user in the training data. Apply the basic user-based collaborative filtering (without considering bias) with cosine similarity. Give the top-1 recommended item to user u2.