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Lumifer comments on Siren worlds and the perils of over-optimised search - Less Wrong
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It's not an issue of proportion, but of whether there will be a single representative of the class in the worlds we search through. We want a fraction of the space such that there is an acceptable world in it with high probability, and no siren/marketing world, with high probability.
Eg if 1/10^100 worlds is acceptable and 1/10^120 worlds is siren/marketing, we might want to search randomly through 10^101 or 10^102 worlds.
Looks like you're basically arguing for the first-past-the-post search -- just take the first world that you see which passes the criteria.
Yep, that works better than what I was thinking, in fact.