Those are really good answers, especially the points about nested JSON structures and generalization. Not sure I understand point #3 -- not familiar with globa

Those are really good answers, especially the points about nested JSON structures and generalization. Not sure I understand point #3 -- not familiar with global vs contextual optimum. The idea is that a global optimum is the aggregate optimum across all users, versus a contextual optimum which is the optimum for just the current user/device? Couldn't you do this by doing regressions on a per-user-id basis or similar if that was the case? (I really don't know)