The following table shows the ratings of item x_{i} by user u_{j}. Use the algorithm proposed in [ResnickISBR94] to predict the rating of item x_{3} by user u_{2}. To receive any credit at all, you must show the intermediate steps of the calculation.
u_{1} | u_{2} | u_{3} | u_{4} | |
x_{1} | 1 | 2 | 2 | 3 |
x_{2} | 3 | 5 | ||
x_{3} | 2 | ? | 3 | 4 |
x_{4} | 4 | 3 | 3 | |
x_{5} | 5 | 1 |