A nice collaborative filtering tutorial “for dummies”
Danny Bickson writes:
I got from M. Burhan, one of our GraphChi users from Germany, the following link to an online book called: A Programmer’s Guide to Data Mining.
There are two relevant chapters that may help beginners understand the basic concepts.
The first one of them is Chapter 2: Collaborative Filtering and Chapter 3: Implicit Ratings and Item Based Filtering.