Not to be a nit-picker, but the Ph.D. dissertation was 1979. The 1982 reference is a four-pager in AI
magazine that had, basically, the same title.
Since then, to my knowledge, Dr. Forgy has not published anything on the
subject of the Rete algorithm.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On
Behalf Of Dusan Sormaz
Sent: Wednesday, November 05, 2003 6:40 PM
To: [EMAIL PROTECTED]
Subject: Re: JESS: Help on Jess
under the hood! :) ..
Mechanism for saving patterns and matchings is rete network.
Done by Charels Forgy in his dissertation (1982-3).
Good explanation in JIA book, chapter 8.
Dusan Sormaz
At 05:56 PM 11/5/2003 -0600, you wrote:
Hi everybody ...
Let assume the following rule base rb, function "save", and working
memory wm:
rb = {
(defrule r1
(foo ?x ?y)
(bar ?y ?z)
=>
(save ?x ?y ?z))
}
wm = {(foo p q), (bar q w), (bar q t)}.
Now, it is easy to see that the first and second facts in wm, (foo p q)
(bar q w), filter all the way down to the bottom of the rete network,
associated to this example, and then become a new activation record. In other
words when rule r1 fires, then the tuple {p,q,w} is going to be saved. Right
... based on the current example:
Q1. What kind of data structure Jess uses for partially storing the facts
(foo p q) (bar q w) activating r1?
Q2. Given that the facts (foo p q) (bar q t) activate r1 as well,
which Jess' method (class) is in charge of iterating over the working
memory for finding more facts, like (bar q t), that activate r1 as well?
Q3. How, tecnically speaking, Jess manages for not testing again facts
which were already used for activating a rule?
Q4. By looking at this example one can see that the fact (foo p q) is in some
sense partially kept in Jess' mind in order to test facts like (bar q w)
and (bar q t) which can activate rule r1. Therefore my question is which
strategy, tecnically speaking, is implemented in Jess for partially keeping in
mind facts such as (foo p q) in order to test complementary facts such as (bar
q w), (bar q t) that could potencially activate a given rule?
Finally, regarding Q4 I know that the overall proccess can be explained via a
forward chaining. Nevertheless, how Jess under the hood deals with this issues?
thank you
Jose Antonio
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* Dušan Šormaz, PhD, Associate
Professor
* Ohio University
* Industrial and Manufacturing Systems Engineering Department
* 277 Stocker Center, Athens, OH 45701-2979
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