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kodos96 comments on Qualitatively Confused - Less Wrong
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If we had enough cputime, we could build a working AI using AIXItl.
*Threadjack*
People go around saying this, but it isn't true:
1) Both AIXI and AIXItl will at some point drop an anvil on their own heads just to see what happens (test some hypothesis which asserts it should be rewarding), because they are incapable of conceiving that any event whatsoever in the outside universe could change the computational structure of their own operations. AIXI is theoretically incapable of comprehending the concept of drugs, let alone suicide. Also, the math of AIXI assumes the environment is separably divisible - no matter what you lose, you get a chance to win it back later.
2) If we had enough CPU time to build AIXItl, we would have enough CPU time to build other programs of similar size, and there would be things in the universe that AIXItl couldn't model.
3) AIXItl (but not AIXI, I think) contains a magical part: namely a theorem-prover which shows that policies never promise more than they deliver.
So I'm a total dilettante when it comes to this sort of thing, so this may be a totally naive question... but how is it that this comment has only +5 karma, considering how apparently fundamental it is to future progress in FAI?
The comment predates the current software; when it was posted (on Overcoming Bias) there was no voting. You can tell such articles by the fact that their comments are linear, with no threaded replies (except for more recently posted ones).