[Pellet-users] Out of memory when using rules

[Somaya Aboulwafa]

Many thanks. I've used: PelletOptions.USE_CONTINUOUS_RULES = true; and it
worked fine with me so far.

Thanks
Somaya

On Sun, Apr 6, 2008 at 7:16 PM, James Howison <james at howison.name> wrote:

> I'm interested in other answers you might get, but have you tried
> setting PelletOptions.USE_CONTINUOUS_RULES = true;?  That's the advice
> I got here recently when dealing with out of heap space errors with
> SWRL rules:
>
> http://lists.owldl.com/pipermail/pellet-users/2008-March/002458.html
>
> On Apr 6, 2008, at 10:52 AM, Somaya Aboulwafa wrote:
> > I forgot to say that i have tried this using both Jena and OWLAPI.
> > When
> > using OWLAPI I got the following exception:
> >
> > Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> >
> > at java.util.Arrays.copyOf(Unknown Source)
> >
> > at java.util.BitSet.ensureCapacity(Unknown Source)
> >
> > at java.util.BitSet.expandTo(Unknown Source)
> >
> > at java.util.BitSet.set(Unknown Source)
> >
> > at org.mindswap.pellet.DependencySet.<init>(*DependencySet.java:97*)
> >
> > at org.mindswap.pellet.RuleBranch.tryBranch(*RuleBranch.java:149*)
> >
> > at org.mindswap.pellet.RuleStrategy.createDisjunctionsFromBinding(*
> > RuleStrategy.java:413*)
> >
> > at org.mindswap.pellet.RuleStrategy.applyRULERule(*RuleStrategy.java:
> > 148*)
> >
> > at org.mindswap.pellet.RuleStrategy.complete(*RuleStrategy.java:319*)
> >
> > at org.mindswap.pellet.ABox.isConsistent(*ABox.java:1605*)
> >
> > at org.mindswap.pellet.ABox.isConsistent(*ABox.java:1489*)
> >
> > at org.mindswap.pellet.KnowledgeBase.consistency(*KnowledgeBase.java:
> > 1568*)
> >
> > at
> > org.mindswap.pellet.KnowledgeBase.isConsistent(*KnowledgeBase.java:
> > 1589*)
> >
> > at org.mindswap.pellet.KnowledgeBase.ensureConsistency(*
> > KnowledgeBase.java:1595*)
> >
> > at org.mindswap.pellet.KnowledgeBase.classify(*KnowledgeBase.java:
> > 1601*)
> >
> > at org.mindswap.pellet.KnowledgeBase.realize(*KnowledgeBase.java:
> > 1630*)
> >
> > at
> > org.mindswap.pellet.KnowledgeBase.getInstances(*KnowledgeBase.java:
> > 2710*)
> >
> > at org.mindswap.pellet.owlapi.Reasoner.getIndividuals(*Reasoner.java:
> > 550*)
> >
> > at Trial1.PolicyReasoningOWLapi.main(*PolicyReasoningOWLapi.java:44*)
> >
> > And When using Jena I got the following similar exception:
> >
> > Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> >
> > at java.util.Arrays.copyOf(Unknown Source)
> >
> > at java.util.BitSet.ensureCapacity(Unknown Source)
> >
> > at java.util.BitSet.expandTo(Unknown Source)
> >
> > at java.util.BitSet.set(Unknown Source)
> >
> > at org.mindswap.pellet.DependencySet.<init>(*DependencySet.java:97*)
> >
> > at org.mindswap.pellet.RuleBranch.tryBranch(*RuleBranch.java:149*)
> >
> > at org.mindswap.pellet.RuleStrategy.createDisjunctionsFromBinding(*
> > RuleStrategy.java:413*)
> >
> > at org.mindswap.pellet.RuleStrategy.applyRULERule(*RuleStrategy.java:
> > 148*)
> >
> > at org.mindswap.pellet.RuleStrategy.complete(*RuleStrategy.java:319*)
> >
> > at org.mindswap.pellet.ABox.isConsistent(*ABox.java:1605*)
> >
> > at org.mindswap.pellet.ABox.isConsistent(*ABox.java:1489*)
> >
> > at org.mindswap.pellet.KnowledgeBase.consistency(*KnowledgeBase.java:
> > 1568*)
> >
> > at
> > org.mindswap.pellet.KnowledgeBase.isConsistent(*KnowledgeBase.java:
> > 1589*)
> >
> > at
> > org.mindswap.pellet.jena.PelletInfGraph.prepare(*PelletInfGraph.java:
> > 267*
> > )
> >
> > at com.hp.hpl.jena.ontology.impl.OntModelImpl.prepare(*
> > OntModelImpl.java:2598*)
> >
> > at Trial1.PolicyReasoningJena.main(*PolicyReasoningJena.java:38*)
> > Thanks in advance,
> > Somaya
> >
> > On Sun, Apr 6, 2008 at 3:09 PM, Somaya Aboulwafa <somaya.ahmad at gmail.com
> > >
> > wrote:
> >
> >> *Hi all,*
> >> *I'm in need for help on how to troubleshoot this problem. I got an
> >> out of
> >> memory exception (heap space). I use an ontology generated by
> >> **Protege
> >> (with OWL Plugin 3.3.1, Build 430) and I use Pellet 1.5.1 APIs. My
> >> ontology
> >> has some classes and individuals and only one rule. The rule is as
> >> follows:
> >> *
> >>
> >> *Agent(?x), IsInactivestaff(?C), hasCred(?X,?C), CoursesProh(?P) ->
> >> hasAD(?X,?P)*
> >>
> >> *However, when I write the rules as follows, then I got no
> >> exception and
> >> the inference works fine:*
> >>
> >> *Agent(?x), IsInactivestaff(?C), hasCred(?X,?C) -> hasAD(?
> >> X,Proh_Teach)*
> >>
> >> *Where: Proh_Teach is an individual of class CoursesProh*
> >> *I have removed all the enumerated classes. As I read in some
> >> previous
> >> posts that it might make a problem with pellet. Also I don't use
> >> min/max
> >> cardinalities. Moreover I have increased the JVM allocated memory
> >> to 500M,
> >> but it doesn't work.*
> >>
> >> *I don't know where the problem? Do I need to re-design my ontology
> >> differently? Or there is something wrong with the first rule?*
> >>
> >> * **Plz let me know if I should send my OWL files.*
> >>
> >> * *
> >>
> >> *Regards,*
> >>
> >> *Somaya*
> >>
> >>
> >>
> > _______________________________________________
> > Pellet-users mailing list
> > Pellet-users at lists.owldl.com
> > http://lists.owldl.com/mailman/listinfo/pellet-users
> > _______________________________________________
> >
> > Sponsored by Clark & Parsia, LLC http://clarkparsia.com/
>
> _______________________________________________
> Pellet-users mailing list
> Pellet-users at lists.owldl.com
> http://lists.owldl.com/mailman/listinfo/pellet-users
> _______________________________________________
>
> Sponsored by Clark & Parsia, LLC http://clarkparsia.com/
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.owldl.com/pipermail/pellet-users/attachments/20080407/ea09cf13/attachment.htm