Mahout trust aware collaborative filtering

Question

I'm trying develop a trust-aware collaborative filtering approach. I have two epinions datasets. One with who trusts who: <ID_truster, ID_trusted>. And one with ratings: <ID_truster, ITEM, RATING>.

How can I make recommendations (User-User based) using only ratings from people who I trust?

At the moment I only make recommendations using the second dataset, taking in consideration every user.

Thank you

Answer 1

The closest thing I can think of is to use a user-neighborhood-based approach, and only include trusted users in the neighborhood. You would need to write some extra code for that, to disqualify untrusted users, by returning a very negative similarity value for them. Look at the UserSimilarity interface.