this post was submitted on 07 Jul 2024
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[–] BigMuffin69@awful.systems 10 points 4 months ago (1 children)

In chess the table base for optimal moves with only 7 pieces takes like ~20 terrabytes to store. And in that DB there are bizzare checkmates that take 100 + moves even with perfect precision- ignoring the 50 move rule. I wonder if the reason these adversarial strats exists is because whatever the policy network/value network learns is way, way smaller than the minimum size of the "true" position eval function for Go. Thus you'll just invariably get these counter play attacks as compression artifacts.

Sources cited: my ass cheeks

[–] sc_griffith@awful.systems 9 points 4 months ago (1 children)

i don't think that can be quite right, as illustrated by an extreme example: consider a game where the first move has player 1 choose "win" or "hypergo." if player 1 chooses win, they win. if player 1 chooses hypergo, begin a game of Go on a 1,000,000,000 x 1,000,000,000 board, and whoever wins that subgame wins. for player 1, the 'true' position eval function must be in some sense incredibly complicated, because it includes hypergo nonsense. but player 1 strategy can be compressed to "choose win" without opening up any counterattacks

[–] sc_griffith@awful.systems 8 points 4 months ago

more generally I suspect that as soon as you are trying to compare some notion of a 'true' position eval function to eval functions you can actually generate you're going to have a very difficult time making correct and clear predictions. the reason I say this is that treating such a 'true' function is essentially the domain of combinatorial game theory (not the same as "game theory"), and there are few if any bridges people have managed to build between cgt and practical Go etc playing engines. so it's probably pretty hard to do

(I know there's a theory of 'temperature' of combinatorial games that I think was developed for purposes of analyzing Go, but I don't think it has any known relationship to reinforcement learning based Go engines)