No machine learning currently, it's just a scoring system which is used for voting (but I intend to break it out to other applications ... eventually).

However because it's a parametric algorithm, it is perfect for optimization using various methods. Machine learning could be one (there's an idea to try out TensorFlow here) or perhaps a genetic algorithm. I'd love to do this but I've at least another two rounds of development to get through first.

That wouldn't stop an interested other developer from giving it a go now, always looking for contributors to the Steem FOSSbot project 😜