Re: Question about "Fuzzy expert system".

Will Dwinnell (76743.1740@compuserve.com)
Tue, 6 Oct 1998 02:00:55 +0200 (MET DST)

W. Siler wrote:
"We would set up three hypotheses: dead battery, no gas and
broken starter. Initially, all these hypotheses would be assigned
truth values of 1. This would make three rules fireable, one for
each hypothesis. We would select one of these rules for firing
according to some reasonable scheme, and stack the other two for
backtracking in case our hypothesis turns out to be false. As we
fire each rule other subhypthoses would be advanced, select one
rule and stack the others, and so on until a trouble is located
or until the hypothesis turns out to be false. If the latter, we
pop a rule off the stack, rife it and keep iterating this
procedure until either the trouble is found or until our system
fails, having emptied all rule stacks and not found any trouble.
This is very simple-minded old-fashioned AI."

Yes, this is the sort fo thing I was getting at. Contrary to the
belief of one previous poster, IF a THEN b or c does make sense.
Backtracking is a convenient way of handling all of these
possibilities as a depth-first search, though I can imagine
situations where all lines are pursued to their ends (a complete
search) because there is a need to check every hypothesis.

-- 
Will Dwinnell




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