JESS: Is there a limit for number of facts?
Hi, Few weeks back I showed up here asking whether JESS is the right tool to use for a system which need to match 8000 commission schemes against 1 million sales record. As part of my 'proof-of-concept' project to decide whether to use JESS to develop a new system, I am experimenting with 1 sales records and few commission schemes (actualy 4 schemes which means 4 rules) I did it in two ways by using embedding JESS into a simple JAVA program. (I am still newbee to Java and Jess. So pardon me for my primitive way of doing things) 1. Load 4 rules into JESS 2. read record by record from sales file (text tile) assert 1 sales fact for each record. 3. do a (run). so the rules will be fired and the sales record is matched against the rules. It may match 0..4 rules. If a sales record matches a rule, then that rule-id is stored in a slot in the sales record. 4. Save the sales record to oracle DB. Steps 2,3,4 are looped 1 times. Everything works well. 1 records are inserted. In this case, file reading and writing into DB is done in JAVA I thought, this should not be the way. 1 (run)s? So I changed the logic. 1. Load 4 rules 2. assert 1 facts. 3. do a (run). So in one shot all records are matched against the rules. 4. Then run a (defquery) get all the sales data facts and put into database in JESS itself. I wrote a small user-function which accepts facts and then inserts the values into DB. Here I face a problem. It inserts only 6000+ records. So I fired (facts) immediately after asserting 1 facsts. I could see only 6000+ records. But I am sure the JAVA function asserts 1 records. Why is it so? Is there a limitation for number of facts in JESS?(very unlikely) Or is this is a limitation of the evaluation copy? I downloaded the evaluation copy from Manning website after I purchased the JIA eBook. Or am I doing something wrong? thanks Yahoo! Mobile- Download the latest ringtones, games, and more!
Re: JESS: Is there a limit for number of facts?
I think Aby wrote: > > Here I face a problem. It inserts only 6000+ records. So I fired (facts) immediately > after asserting 1 facsts. I could see only 6000+ records. But I am sure the JAVA > function asserts 1 records. > The most likely explanation is that Jess doesn't allow duplicate facts, and you've got duplicate identical sales records. The assertFact() method will return null to let you know when you try to assert a Fact that's an exact copy of an existing Fact. In your case, the right thing to do would be to add another slot containing a transaction number or other identifier to each sales record fact -- if you don't already have one, you can just make one up for Jess's benefit. The gensym() method in RU.java and the (gensym*) function in Jess are handy for this purpose -- each time they are called they return a unique symbol which you could use directly for a transaction identifier. - 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]
RE: JESS: Is there a limit for number of facts?
I think that Abby wrote: >>Here I face a problem. It inserts only 6000+ records. Hi Abby, 1. If you are using made-up data, check that your records are unique. Jess will only assert one fact for one unique combination of its slot values. In other words, multiple facts with the exact same slot values cannot exist in working memory. Make sure that 4,000 of your 10,000 facts aren't duplicates. 2. If that's not the case, then send us your code. Cheers, Jason Jason Morris Morris Technical Solutions [EMAIL PROTECTED] www.morristechnicalsolutions.com fax/phone: 503.692.1088 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: Is there a limit for number of facts?
Hi Aby, I don't know if there is other limit than the physical memory size, but if it exists is far greater than 6000+. I think your problem is that you have duplicate records in your DB, and all the facts in the engine are unique. When asserting a new fact that is identical to a previously asserted one only one remains. Regards. Rodolfo Martin. > Hi, > > Few weeks back I showed up here asking whether JESS is the right tool to use for a system which need to match 8000 commission schemes against 1 million sales record. > > As part of my 'proof-of-concept' project to decide whether to use JESS to develop a new system, I am experimenting with 1 sales records and few commission schemes (actualy 4 schemes which means 4 rules) > > I did it in two ways by using embedding JESS into a simple JAVA program. (I am still newbee to Java and Jess. So pardon me for my primitive way of doing things) > > 1. Load 4 rules into JESS > 2. read record by record from sales file (text tile) > assert 1 sales fact for each record. > 3. do a (run). so the rules will be fired and the sales record is matched against the rules. It may match 0..4 rules. If a sales record matches a rule, then that rule-id is stored in a slot in the sales record. > > 4. Save the sales record to oracle DB. > > Steps 2,3,4 are looped 1 times. Everything works well. 1 records are inserted. In this case, file reading and writing into DB is done in JAVA > > I thought, this should not be the way. 1 (run)s? > > So I changed the logic. > > 1. Load 4 rules > 2. assert 1 facts. > 3. do a (run). So in one shot all records are matched against the rules. > 4. Then run a (defquery) get all the sales data facts and put into database in JESS itself. I wrote a small user-function which accepts facts and then inserts the values into DB. > > Here I face a problem. It inserts only 6000+ records. So I fired (facts) immediately after asserting 1 facsts. I could see only 6000+ records. But I am sure the JAVA function asserts 1 records. > > Why is it so? Is there a limitation for number of facts in JESS?(very unlikely) Or is this is a limitation of the evaluation copy? I downloaded the evaluation copy from Manning website after I purchased the JIA eBook. Or am I doing something wrong? > > thanks > > > Yahoo! Mobile- Download the latest ringtones, games, and more! WebMail - movilab.net Telefsnica Msviles Espaqa 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: Nested objects macthing guidelines
Hi all, I'm a relative newbie to Jess since,I've worked previously with CLIPS for a year, but using plain deftemplates (no nested objects). I'm actually evaluating using Jess but I'm a bit disoriented about how to write patterns that match complex nested objects/facts (with Lists and Maps) as those my KB would have. I've read the Manual, studied the examples and also read many archived threads of this mailing list concerning this issues (Detecting changes in nested Objects, Working with collections, RDF...), which have been quite instructive, but are beyond my actual point I've tried the simplified example that follows and it works but I wonder if is there better ways to achieve it (mapping objects to a plain templates, RDF...), as long as the nesting level increase the rules get uglier... Regards Rodolfo Martin (deftemplate Address (slot street(type STRING)) (slot number(type INTEGER)) ) (deftemplate Complex (slot name(type STRING)) (slot address) ) (defrule matchFredsfromRedStreet (Complex (name ?n&"Fred")(address ?a&:(eq (fact-slot-value ?a street) "Red"))) => (printout t "Fred lives at number " (fact-slot-value ?a number) crlf) ) WebMail - movilab.net Telefsnica Msviles Espaqa 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: Nested objects macthing guidelines
I think Rodolfo wrote: > > (defrule matchFredsfromRedStreet > (Complex (name ?n&"Fred") (address ?a&:(eq (fact-slot-value ?a street) "Red"))) > => > (printout t "Fred lives at number " (fact-slot-value ?a number) > crlf) > ) Better to write it this way: (defrule matchFredsfromRedStreet (Complex (name "Fred") (address ?a)) ?a <- (Address (street "Red") (number ?num)) => (printout t "Fred lives at number " ?num crlf)) Now, when you get into using Maps and Lists, as you mentioned, you are going to have to start using function calls. But fact-slot-value isn't one of them, generally: that's never really necessary except for tool-building, and if you find yourself using it, it's generally a sign that you're doing something the hard way. - 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: Very large hash tables
Ernest, I don't know if you've come across this, but Jess is _exactly_ the kind of system that will have problems with very large hash tables if you're not careful. There's a weird threshold that can occur with any Java data structure that uses large arrays of Object references (Object[]). If the size of the Object array exceeds the maximum size of objects that can be placed in the "new generation", garbage collection performance can be severely impacted. What ends up happening (I think) is that the single "big" object gets shoved into the old generation, and has zillions of references to objects back in the new generation. I think those objects are in turn lifted out and pushed into the old generation. So highly "active" use of a very large hash table can result in very inefficient garbage collections, if the situation is not addressed. I've seen the ordered tree collections drop garbage collection times by a factor of four. In my day job we have a custom-built Btree structure that drops overall collection times by a factor of about 100, in this situation... In test runs I've seen everything running peachy in terms of throughput and speed, overall...then that new generation threshold is reached, and garbage collection becomes a real problem. These are big hash tables, of course (outside of Jess), but the problem's real. The simplest way to create it is to create a new hashtable object with a very large initial capacity (say, 10 million). Make a test program that pounds the hash table with adds and deletes, in a mix. Turn on verbose:gc and adjust the initial size up and down. Very shortly you'll find a "mystery point" where GC just takes much longer to run. The solution is moving to trees, using a chained hash table system, or enlarging the size of the new generation. Frankly, the Java VM seems to prefer the trees. RJ 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: java reflection
Hi all ! I have a question. I have a class named Parameter in package inf.verification.core, its constructor is : Parameter(String name, Object value, String unit) And i tried to use this class in jess over java reflection: (import inf.verification.core.*) (import java.lang.*) (bind ?x (new Parameter "Laenge" (new Double 125.5) "meter")) it give the error: class Parameter not found ! Why is the path for class Parameter wrong ? And is the syntax : (bind ?x (new Parameter "Laenge" (new Double 125.5) "meter")) correctly ? thanks Thao 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: java reflection
I think that Thao wrote: >>Why is the path for class Parameter wrong ? Hi Thao, In general, make sure that you have the inf.verification.core package on your Jess classpath, else Jess can't find your class. Send us your path so we can check it. >>And is the syntax :(bind ?x (new Parameter "Laenge" (new Double 125.5) "meter")) correctly? Yes, that should work fine. BTW - java.lang.* is implictly imported in Jess -- no need to explicitly import it. Cheers, Jason Jason Morris Morris Technical Solutions [EMAIL PROTECTED] www.morristechnicalsolutions.com fax/phone: 503.692.1088 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: java reflection
I think Thao wrote: > > class Parameter not found ! Why is the path for class > Parameter wrong ? > Just as with any other Java program, the class path needs to properly include the Parameter class, and the class itself needs to be public. Make sure that when you start Jess, the CLASSPATH environment variable, or the -classpath switch, properly includes the location of the Parameter class. > (bind ?x (new Parameter "Laenge" (new Double 125.5) "meter")) Looks perfect. - 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: unimplemented function detemplate
Hi all ! I have a rule like: (defrule inputParameterSpannungsnachweis (nachweis "Spannungsnachweis") => (import java.lang.*) (bind ?querschnitt "Querschnitt") (bind ?Fx "Fx" ) (bind ?Fy "Fy" ) (bind ?My "My" ) (bind ?querschnittValue (new java.lang.String "I120")) (bind ?FxValue (new java.lang.Double 150.0 )) (bind ?FyValue (new java.lang.Double 200.0 )) (bind ?MyValue (new java.lang.Double 200.0 )) (bind ?querschnittsUnit "") (bind ?FxUnit "KN" ) (bind ?FyUnit "KN" ) (bind ?MyUnit "KNcm") (deftemplate parameter (multislot name ) (multislot value) (multislot unit )) (bind ?x (assert (parameter (name ?querschnitt ?Fx ?Fy ?My) (value ?querschnittValue ?FxValue ?FyValue ?MyValue) (unit ?querschnittsUnit ?FxUnit ?FyUnit ?MyUnit) then i use :(assert (nachweis "Spannungsnachweis")) (run) then there is an error: unimplemented function deftemplate. I dont know why !??:( thanks very much Thao 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: unimplemented function detemplate
I think that Thao wrote: >> then there is an error: unimplemented function deftemplate. I dont know why !??:( Hold on there, Thao! You may be giving poor Ernest a stroke as I write this, not to mention violating the Zen of Jess http://herzberg.ca.sandia.gov/jess/zen.shtml :-D Hopefully he's off eating dinner now. Jess is rightly complaining because you *cannot* define a deftemplate inside a rule like this. Defrule and deftemplate are two separate "constructs", not true functions as Ernest points out in JIA and in the Jess documentation -- and the RHS of rules are supposed to be function calls. Also, the deftemplate for a fact should come before the rules that use it. Why don't you tell us what you're trying to do so that we can suggest something? Cheers, Jason Jason Morris Morris Technical Solutions [EMAIL PROTECTED] www.morristechnicalsolutions.com fax/phone: 503.692.1088 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: unimplemented function detemplate [debug code]
Hi again Thao, I moved the (deftemplate parameter) out of your rule and formatted your code a bit. Try this... ;; = thao.clp === (clear) (watch all) (reset) ;; See JIA pp. 79-80 about doing a (reset) when starting a program. (deftemplate parameter (multislot name ) (multislot value) (multislot unit )) (defrule inputParameterSpannungsnachweis (nachweis "Spannungsnachweis") => (import java.lang.*) (bind ?querschnitt "Querschnitt") (bind ?Fx "Fx") (bind ?Fy "Fy") (bind ?My "My") (bind ?querschnittValue (new java.lang.String "I120")) (bind ?FxValue (new java.lang.Double 150.0 )) (bind ?FyValue (new java.lang.Double 200.0 )) (bind ?MyValue (new java.lang.Double 200.0 )) (bind ?querschnittsUnit "") (bind ?FxUnit "KN") (bind ?FyUnit "KN") (bind ?MyUnit "KNcm") (bind ?x (assert (parameter (name ?querschnitt ?Fx ?Fy ?My) (value ?querschnittValue ?FxValue ?FyValue ?MyValue) (unit ?querschnittsUnit ?FxUnit ?FyUnit ?MyUnit) (assert (nachweis "Spannungsnachweis")) (run) ;; . and I got this output ==> Focus MAIN ==> f-0 (MAIN::initial-fact) MAIN::inputParameterSpannungsnachweis: +1+1+1+1+t ==> f-1 (MAIN::nachweis "Spannungsnachweis") ==> Activation: MAIN::inputParameterSpannungsnachweis : f-1 FIRE 1 MAIN::inputParameterSpannungsnachweis f-1 ==> f-2 (MAIN::parameter (name "Querschnitt" "Fx" "Fy" "My") (value ) (unit "" "KN" "KN" "KNcm")) <== Focus MAIN Is this what you wanted? Cheers, Jason Jason Morris Morris Technical Solutions [EMAIL PROTECTED] www.morristechnicalsolutions.com fax/phone: 503.692.1088 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: Is there a limit for number of facts?
Thanks Rodolfo Martin, Jason and Ernest for the replies All of you guessed the same reason and it was the correct reason for missing facts. Actually there is a unique serial number in the sales record. I did not use it as part of the 'fact' because I was concentrating on the 'rules' (commission scheme conditions) part and, obviously, serial number is not part of of any condition. So I asserted facts with slots data that are used in the rules. Thanks again for prompt and correct replies. I really appreciate your efforts for keeping this online forum a really useful one. I hope I will be able to convince my bosses to agree to buy JESS as I find it really fast, easy to learn, priced right and of course a very good online support. regards Aby Rodolfo <[EMAIL PROTECTED]> wrote: Hi Aby,I don't know if there is other limit than the physical memory size, but ifit exists is far greater than 6000+.I think your problem is that you have duplicate records in your DB, and allthe facts in the engine are unique. When asserting a new fact that isidentical to a previously asserted one only one remains.Regards.Rodolfo Martin.> Hi,> > Few weeks back I showed up here asking whether JESS is the right tool touse for a system which need to match 8000 commission schemes against 1million sales record.> > As part of my 'proof-of-concept' project to decide whether to use JESS todevelop a new system, I am experimenting with 1 sales records and fewcommission schemes (actualy 4 schemes which means 4 rules)> > I did it in two ways by using embedding J! ESS into a simple JAVA program.(I am still newbee to Java and Jess. So pardon me for my primitive way ofdoing things)> > 1. Load 4 rules into JESS> 2. read record by record from sales file (text tile)> assert 1 sales fact for each record.> 3. do a (run). so the rules will be fired and the sales record is matchedagainst the rules. It may match 0..4 rules. If a salesrecord matches a rule, then that rule-id is stored in a slot in thesales record.> > 4. Save the sales record to oracle DB.> > Steps 2,3,4 are looped 1 times. Everything works well. 1 recordsare inserted. In this case, file reading and writing into DB is done in JAVA> > I thought, this should not be the way. 1 (run)s?> > So I changed the logic.> > 1. Load 4 rules> 2. assert 1 facts.&! gt; 3. do a (run). So in one shot all records are matched against the rules.> 4. Then run a (defquery) get all the sales data facts and put intodatabase in JESS itself. I wrote a small user-function which accepts factsand then inserts the values into DB.> > Here I face a problem. It inserts only 6000+ records. So I fired (facts)immediately after asserting 1 facsts. I could see only 6000+ records.But I am sure the JAVA function asserts 1 records.> > Why is it so? Is there a limitation for number of facts in JESS?(veryunlikely) Or is this is a limitation of the evaluation copy? Idownloaded the evaluation copy from Manning website after I purchased theJIA eBook. Or am I doing something wrong?> > thanks> > > Yahoo! Mobile- Download the latest ringtones, games, andmore!WebMail -movilab.netTelefsnica Msviles EspaqaTo 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] Yahoo! Mobile- Download the latest ringtones, games, and more!
