Re: Emulation vs. Simulation

From: Eugene Leitl (
Date: Wed Mar 28 2001 - 02:22:14 MST

On Tue, 27 Mar 2001, James Rogers wrote:

> The "lookup table", as it is being used here, is a perfectly optimal and
> correct model, but useless because it requires mind-boggling quantities of
> memory. (Actually, "lookup table" has been poorly defined thus far; I

Right, since you can't just map sensorics to motorics without using hidden
state (gobs and oodlefuls of hidden state, which also acts as part of the
input, making it a rather nondeterministic lookup table, if you're just
looking at world-visible I/O stream), or using a current-age light cone as
vector input, which is a tad wasteful.

> don't think everyone is using it the same way.) Writing heuristics to
> replace sections of the table is a sub-optimal solution (provably so) and
> would have serious consequences if implemented on a broad scale.

Actually, you can prove that that table is anything but random, unless
compressed optimally. There also smart lookup tables, which use all
manners of interpolation.

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