Problem 4 (Recommender Systems). Consider the following movie ratings for users A-D: Movie A A 5 1 1 Terminator Frozen F

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Problem 4 Recommender Systems Consider The Following Movie Ratings For Users A D Movie A A 5 1 1 Terminator Frozen F 1 (76.79 KiB) Viewed 73 times

Problem 4 (Recommender Systems). Consider the following movie ratings for users A-D: Movie A A 5 1 1 Terminator Frozen Frozen 2 Inside Out The Cabin in the Woods Watched B C D 1 0 1 1 1 1 0 0 1 1 0 0 1 1 5 4 4 1 Rated B C D 1 2 2 2 1 1 5 1 1 0 (a) Using "Watched”, compute Jaccard similarity for all pairs of users. (b) Using “Rated”, compute cosine similarity similarity for all pairs of users. (c) Using “Rated”, compute centered cosine similarity similarity for all pairs of users. (d) Which of your answers would change if we add another item that nobody has rated? Explain. (e) What potential bias could sequels introduce into the rating matrix?