I started reading through the linked tutorial, but I think I need to first back up and review reinforcement learning (I took 2 Coursera classes in RL, and helped with one project at a previous job, so I am at a beginner stage).<p>I love deep learning, a practical way to solve many problems (and most of my work over the last 6 years) but DL seems incomplete as far as explainability, causation, etc. Anyway, I just retired last week (mostly to take care of my wife who is having a health crisis) so I have plenty of time to study GFN, probably starting with re-taking the 2 Coursera classes on RL and then finishing the RL specialization.