Transfer Learning for Collaborative Filtering Using a Psychometrics Model

Algorithm 1

Collaborative filtering using multidimensional psychometrics model (CFMPM).

Input: Training set

Output: , , , and ()

() Initialize parameters , , , , , , , and .

() For each iteration

()   Randomly permutate the data in .

()   For each in

()     Compute by (15);

()     Compute (; ) by (16);

()     Update the parameters according to (17)–(20).

()   End for

()   Decrease , , ; they are multiplied by 0.9.

() End for