Re: JESS: Jess: salience
I think that this discussion about salience may be related to other post Re: JESS: Using a rule engine for plan recognition if you need to change order of rule firing you may establish control facts that would trigger or de-trigger executions. Dusan Sormaz At 10:25 AM 1/13/2006, you wrote: I think Yura wrote: [Charset koi8-r unsupported, filtering to ASCII...] > > (set-salience-evaluation every-cycle) > > I think that would be really slow. Only if the agenda is large, but yes, it could slow things down. > However the problem is quite common, so probably we may use some > Java API to reevaluate the salience just once. The question is which > one. The problem is that if you reevaluate the salience of a single activated rule, then the whole agenda has to be recomputed. You actually wouldn't gain much, assuming these salience changes were frequent. An alternative to every-cycle is when-activated, which will evaluate the salience of a rule each time that rule is placed on the agenda. Thus salience changes will affect new firings, but not activations that existed before the change. This might be just fine. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] * * Duan ormaz, PhD, Associate Professor * Ohio University * Industrial and Manufacturing Systems Engineering Department * 277 Stocker Center, Athens, OH 45701-2979 * phone: (740) 593-1545 * fax: (740) 593-0778 * e-mail: [EMAIL PROTECTED] * url: http://www.ent.ohiou.edu/~sormaz *
Re: JESS: Jess: salience
I think Yura wrote: [Charset koi8-r unsupported, filtering to ASCII...] > > (set-salience-evaluation every-cycle) > > I think that would be really slow. Only if the agenda is large, but yes, it could slow things down. > However the problem is quite common, so probably we may use some > Java API to reevaluate the salience just once. The question is which > one. The problem is that if you reevaluate the salience of a single activated rule, then the whole agenda has to be recomputed. You actually wouldn't gain much, assuming these salience changes were frequent. An alternative to every-cycle is when-activated, which will evaluate the salience of a rule each time that rule is placed on the agenda. Thus salience changes will affect new firings, but not activations that existed before the change. This might be just fine. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
JESS: Jess: salience
> (set-salience-evaluation every-cycle) I think that would be really slow. However the problem is quite common, so probably we may use some Java API to reevaluate the salience just once. The question is which one. Yuri To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
Re: JESS: salience
I think =?iso-8859-1?Q?=5BEXTERN=5D_Manuel_Kollmu=DF?= wrote: > > I want to change the salience of a rule during process. > > e.g. > > (defrule number1 > (salience 0) > You could use a function call or defglobal to return the salience, then use (set-salience-evaluation) to tell Jess to reevaluate salience every time a rule is fired; (defrule number1 (salience (get-salience number1)) ... (deffunction get-salience (?name) (bind ?s (fetch (str-cat ?name "-salience"))) (if (eq ?s nil) then (return 0) else (return ?s))) (deffunction set-salience (?name, ?value) (store (str-cat ?name "-salience") ?value)) (set-salience-evaluation every-cycle) > > How can I do this so that the new salience is save even after a restart > of the program? > You'd have to store the values yourself in some kind of persistent store -- a database, etc -- and restore them when the program starts up. - Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National LabsFAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED]
JESS: salience
hi jess users I want to change the salience of a rule during process. e.g. (defrule number1 (salience 0) => (if … then (“increase salience”) else (“decrease salience”)) How can I do this so that the new salience is save even after a restart of the program? thanks in advance!
