Silk: Error loading resources

[friesen...@googlemail.com]

Dear Silk group,
I get the following error during the silk execution. Any ideas of how to fix the problem. For the details plese see the attached file.

Thank you in advance.
Natalja


WARNING: Error loading resources
Throwable occurred: java.lang.UnsupportedOperationException: empty.reduceLeft
    at scala.collection.TraversableOnce$class.reduceLeft(TraversableOnce.scala:152)
    at scala.collection.immutable.Set$EmptySet$.reduceLeft(Set.scala:52)
    at scala.collection.TraversableOnce$class.reduce(TraversableOnce.scala:180)
    at scala.collection.immutable.Set$EmptySet$.reduce(Set.scala:52)
    at de.fuberlin.wiwiss.silk.plugins.metric.SoftJaccardDistance.index(SoftJaccardDistance.scala:43)
    at de.fuberlin.wiwiss.silk.linkagerule.similarity.Comparison.index(Comparison.scala:80)
    at de.fuberlin.wiwiss.silk.linkagerule.LinkageRule.index(LinkageRule.scala:55)
    at de.fuberlin.wiwiss.silk.GenerateLinksTask$$anonfun$de$fuberlin$wiwiss$silk$GenerateLinksTask$$createCaches$2.apply(GenerateLinksTask.scala:104)
    at de.fuberlin.wiwiss.silk.GenerateLinksTask$$anonfun$de$fuberlin$wiwiss$silk$GenerateLinksTask$$createCaches$2.apply(GenerateLinksTask.scala:104)
    at de.fuberlin.wiwiss.silk.cache.FileEntityCache$$anonfun$write$1.apply(FileEntityCache.scala:46)
    at de.fuberlin.wiwiss.silk.cache.FileEntityCache$$anonfun$write$1.apply(FileEntityCache.scala:43)
    at de.fuberlin.wiwiss.silk.util.sparql.SimpleEntityRetriever$EntityTraversable$$anonfun$foreach$1$$anonfun$apply$3.apply(SimpleEntityRetriever.scala:147)
    at de.fuberlin.wiwiss.silk.util.sparql.SimpleEntityRetriever$EntityTraversable$$anonfun$foreach$1.apply(SimpleEntityRetriever.scala:146)
    at de.fuberlin.wiwiss.silk.util.sparql.SimpleEntityRetriever$EntityTraversable$$anonfun$foreach$1.apply(SimpleEntityRetriever.scala:136)
    at de.fuberlin.wiwiss.silk.util.sparql.RemoteSparqlEndpoint$ResultTraversable$$anonfun$foreach$1$$anonfun$apply$mcVI$sp$1.apply(RemoteSparqlEndpoint.scala:67)

[Robert Isele]

Hi Natalja,

the UnsupportedOperationException most likely indicates a bug. I recall that this bug has been present in Silk 2.5.3. I uploaded a recent build of Silk Single Machine that should fix this here [1].

Cheers,

Robert

[1] https://dl.dropboxusercontent.com/u/13263219/silk-singlemachine-2.5.4.jar

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[friesen...@googlemail.com]

Thank you very much Robert,
I'll try the new version.

Best regards
Natalja

[friesen...@googlemail.com]

Dear Robert,
Unfortunately I get the same error with the new silk version 2.5.4. I would really appreciate any ideas or advices.

Best regards
Natalja

[Robert Isele]

Hi Natalja,

thank you for testing. I found the bug in the indexing function of the soft-jaccard metric. I uploaded the fixed version here:

https://dl.dropboxusercontent.com/u/13263219/silk-singlemachine-2.5.4-20131014.jar

Cheers,
Robert

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[friesen...@googlemail.com]

Than you Robert for the fast answer.
I'll test the proposed version.

Best regards
Natalja

[friesen...@googlemail.com]

With this version it works fine.

Thank you a lot :)