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Lumifer comments on Agent-Simulates-Predictor Variant of the Prisoner's Dilemma - Less Wrong Discussion

5 Post author: Gram_Stone 15 December 2015 07:17AM

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Comment author: Lumifer 16 December 2015 01:30:21AM 0 points [-]

The human did something functionally equivalent to making binding commitments.

Unless you want to screw around with terminology, making a move in a game is not "making a binding commitment". It's making a move.

the claim being made in the OP

Let's look at the OP:

So if I decide to write down 9, then it will predict this, and it will decide to write 1. Therefore, I can write down 9 without fear.

This is predicting the opponent's response. Since UDT (according to the OP) does write down 1, the prediction is accurate.

UDT looks very predictable to me in this case.

Comment author: gjm 16 December 2015 03:18:25AM -1 points [-]

It isn't making a move that I suggested was equivalent to making a binding commitment. (In this case, it's working out one's best strategy, in the presence of a perfect predictor.) It's equivalent in the sense that both have the effect of narrowing the options the other player thinks you might take. That's not a good notion of equivalence in all contexts, but I think it is here; the impact on the game is the same.

Yes, there are situations in which UDT-as-understood-by-the-OP produces predictable results. That doesn't mean that UDT (as understood etc.) Is consistently predictable, and it remains the case that the OP explicitly characterized the UDT-using agent as a superhumanly effective predictor.