I spent a good couple of hours trying to get into machine learning, using Microsoft.ML,from zero previous knowledge. I did the iris and sentiment tutorial on Microsofts docs, but when I tried moving to my own (very simple) dataset, I got exception after exception not understanding why. No one else seem to have the problems (because it's so new - to the public) and the source on github is apparently incomplete so I couldn't dig all the answers out myself. It might be stable and mature but it's not a good entry point for beginners imo.