Question: RS, refers to Recommender Systems, please answer this question accurately. 1. calculate the rating of Alice on movie 5: 1) using user-based CF and Pearson

RS, refers to Recommender Systems, please answer this question accurately. 1.

RS, refers to Recommender Systems, please answer this question accurately.

1. calculate the rating of Alice on movie 5: 1) using user-based CF and Pearson correlation similarity measure 2) using item-based CF and cosine similarity measure Moviel Movie2 Movie3 Movie4 Movie) Alice 5 3 4 ? 4 3 User1 3 2 3 3 3 5 User2 User3 User4 3 3 1 4 5 5 2 1 2. How to evaluate a RS? 3. Explain the basic idea of TF-IDF. What kind of RS use this metric

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