I don't see the AGZ paper explain what the mean action-value Q(s,a) should be for a node that hasn't been expanded yet. The equation for Q(s,a) has the term 1/N(s,a) in it because it's supposed to average over N(s,a) visits. But in this case N(s,a)=0 so that won't work.
Does anyone know how this is supposed to work? Or is it another detail AGZ didn't spell out?
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