coolguyandClaude Opus 4.7
6c9babe769
OpenSpiel's Deep CFR records strategy samples at opponent nodes during the traverser's tree walk; storing on traverser nodes under external sampling drops the ρ_p reach factor and biases the average-policy estimate. Reject that config combination at load time and add a research note deriving why outcome sampling is unaffected while external is not. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>