Mike,
If memory serves, this thread started out as a discussion about binding in an
AGI context. At some point, the terms "forward-chaining" and
"backward-chaining" were brought up and, then, got used in a weird way (I
thought) as the discussion turned to temporal dependencies and hierarchical
logic constructs. When it appeared no one else was going to clear up the
ambiguities, I threw in my two cents.
I made a spectacularly good living in the late 1980's building expert system
engines and knowledge engineering front-ends, so I think I know a thing or two
about that "narrow AI" technology. Funny thing, though, at that time, the trade
press were saying expert systems were no longer "real AI." They worked so well
at what they did, the "mystery" wore off. Ah, the price of success in AI. ;-)
What makes the algorithms used in expert system engines less than suitable for
AGI is their static ("snapshot") nature and "crispness." AGI really needs some
form of dynamic programming, probabilistic (or fuzzy) rules (such as those built
using Bayes nets or hidden Markov models), and runtime feedback.
Thanks for the kind words.
Cheers,
Brad
Mike Tintner wrote:
Brad: By definition, an expert system rule base contains the total sum
of the
knowledge of a human expert(s) in a particular domain at a given point in
time. When you use it, that's what you expect to get. You don't expect
the
system to modify the rule base at runtime. If everything you need isn't in
the rule base, you need to talk to the knowledge engineer. I don't know of
any expert system that adds rules to its rule base (i.e., becomes “more
expert”) at runtime. I'm not saying necessarily that this couldn't be
done,
but I've never seen it.
In which case - (thanks BTW for a v. helpful post) - are we talking
entirely here about narrow AI? Sorry if I've missed this, but has anyone
been discussing how to provide a flexible, evolving set of rules for
behaviour? That's the crux of AGI, isn't it? Something at least as
flexible as a country's Constitution and Body of Laws. What ideas are
on offer here?
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