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- Message-ID: <199208121255.AA23632@prompto.irisa.fr>
- Newsgroups: bit.listserv.csg-l
- Date: Wed, 12 Aug 1992 14:55:14 +0200
- Sender: "Control Systems Group Network (CSGnet)" <CSG-L@UIUCVMD.BITNET>
- From: Oded Maler <Oded.Maler@IRISA.FR>
- Subject: Re: Blocks worlds
- Lines: 48
-
- [From Oded Maler 920812]
-
- (Bill Powers, yesterday):
-
- > What would happen to AI and AL models if all computations
- > were limited to 1 percent accuracy? ... etc.
-
- The point is that there is some level where we (seem, at least, to)
- work in discrete terms, e.g., "if my PC doesn't boot then I replace
- the diskette" ,etc. The underlying assumption is that there are
- lower-level modules, employing feed-back all the way down, making
- sure that the abstract action "replace the diskette" is being performed
- in a noisy world (in fact this is a too complicated example because
- even sub-tasks of this action are not yet explainable *in detail* in
- PCT style - try running Little Man in a non-uniform environment with
- obstacles, non-reversible consequences, dead-ends [and this is by
- no means an attempt to dismiss its achievements - just to note that
- there are many hard problems in the highr-levels]).
-
- Now, it's not clear what 1% accuracy means in this abstract world,
- because the disk-drive cannot be 99% pregnant - and if I buy from you
- a low-level black box, I trust that it will work. If you mean
- inaccuracy in the higher-level, that is, replacing the diskette cannot
- be performed or it may not solve the booting problem, and maybe
- kicking the table will solve it, then you come to the realm of the AI
- methods - searching among alternatives for actions, an activity that
- needs a lot of creative imagination (more than I have for the moment)
- in order to be perceived as gradient following, as servoing for
- complex perceptions etc. The people who investigate such phenomena
- surely abstract away the lower levels in the same way you abstract
- away the micro-structure of neural and muscular cells.
-
- Now I come back to my basic rhetoric question: goal-achieving in this
- abstract world with simplifying assumptions should be much easier than
- in reality - the lower-level black boxes are assumed to be perfect,
- there is no conflict in actions, and still it is very hard to to give
- tractable way of solving everyday problems. Why? What is wrong in our
- verbal account of our introspection concerning the way we operate in
- this level? Do the higher-level percepts and references carry with
- them some concrete features of the lower level ones from which
- they are constructed/grounded in such a way that the solution "flow"
- instead of being searched-for/calculated?
-
- I don't expect immediate answers..
-
- Best regards
-
- --Oded
-