Hi,
Regarding this issue I am in the same situation. I mean, I tried to extract the most valuable variables from node "Random Forest Learner" but seems there are not trivial way to do so. I tried to use, as suggested by Iris, the node "Tree ensemble Model Extract", the node "Tree ensemble statistics" but none of these guys show any list of variable by means of its weight on the model.
I would appreciate any help,
Cheers!
Sergi