Consider the following ratings table between five users and six items. User1 User2 User3 User4 User5 Item1 5 4 ? 7 1 Item2 6 ? 3 4 ? || Item4 4 ? 1 6 2 Item5 3 5 1 ? 2 Itemo ? 4 ? 4 5 a. Predict the values of unspecified ratings of User2 using user-based collaborative filtering algorithms. Use the Pearson correlation with mean-centering. (10M) b. Predict the values of unspecified ratings of User2 using item-based collaborative filtering algorithms. Use the adjusted cosine similarity. (10M) Consider the following ratings table between five users and six items. User1 User2 User3 User4 User5 Item1 5 4 ? 7 1 Item2 6 ? 3 4 ? || Item4 4 ? 1 6 2 Item5 3 5 1 ? 2 Itemo ? 4 ? 4 5 a. Predict the values of unspecified ratings of User2 using user-based collaborative filtering algorithms. Use the Pearson correlation with mean-centering. (10M) b. Predict the values of unspecified ratings of User2 using item-based collaborative filtering algorithms. Use the adjusted cosine similarity. (10M)