A couple of weeks ago I covered GraphChi by Aapo Kyrola in my blog. Here is a quick tutorial for trying out GraphChi collaborative filtering toolbox that I wrote. Currently it supports ALS (alternating least squares), SGD (stochastic gradient descent), bias-SGD (biased stochastic gradient descent) , SVD++ , NMF (non-negative matrix factorization), SVD (restarted lanczos, and one sided lanczos), RB