Problems with coreference

[nopper]

I am having troubles running a NLP server with coreference resolution. Here's the things I've tried in order:

Using just --ner-forward-coref won't work because of annotator dependencies. Apparently NerSpanBuffer attribute is not provided by any of the previous annotators in the pipeline.

$ bin/fac nlp --wsj-forward-pos --transition-based-parser --conll-chain-ner --ner-forward-coref
..
Exception in thread "main" java.lang.AssertionError: assertion failed: Prerequisite interface cc.factorie.app.nlp.ner.NerSpanBuffer not satisfied before cc.factorie.app.nlp.coref.NerForwardCoref$@681aad3b gets called in pipeline cc.factorie.app.nlp.segment.DeterministicNormalizingTokenizer$@1ee4730 cc.factorie.app.nlp.segment.DeterministicSentenceSegmenter$@3af4e0bf cc.factorie.app.nlp.segment.PlainTokenNormalizer$@60094a13 cc.factorie.app.nlp.pos.WSJForwardPosTagger$@6f70f32f cc.factorie.app.nlp.lemma.WordNetLemmatizer$@cc6460c cc.factorie.app.nlp.parse.OntonotesTransitionBasedParser$@5aceec94 cc.factorie.app.nlp.ner.ConllChainNer@52350abb cc.factorie.app.nlp.ner.BilouConllNerChunkAnnotator$@35293c05 cc.factorie.app.nlp.coref.NerForwardCoref$@681aad3b

By using --parse-forward-coref the server is started correctly but an exception is thrown as soon as some text gets annotated. I guess that the NerSpanBuffer attribute is null.

$ bin/fac nlp --wsj-forward-pos --transition-based-parser --conll-chain-ner --parse-forward-coref
...
Exception in thread "ServerThread" java.lang.NullPointerException
        at cc.factorie.app.nlp.coref.NerPhraseFinder.apply(MentionPhraseFinder.scala:58)
        at cc.factorie.app.nlp.phrase.ParseBasedPhraseFinder.getPhrases(ParseBasedMention.scala:45)
        at cc.factorie.app.nlp.coref.ParseForwardCoref.annotateMentions(ForwardCoref.scala:34)
        at cc.factorie.app.nlp.coref.CorefSystem.process(ForwardCoref.scala:261)
        at cc.factorie.app.nlp.DocumentAnnotationPipeline$$anonfun$process$2.apply(DocumentAnnotatorPipeline.scala:37)
        at cc.factorie.app.nlp.DocumentAnnotationPipeline$$anonfun$process$2.apply(DocumentAnnotatorPipeline.scala:35)
        at scala.collection.TraversableLike$WithFilter$$anonfun$foreach$1.apply(TraversableLike.scala:733)
        at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
        at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
        at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:732)
        at cc.factorie.app.nlp.DocumentAnnotationPipeline.process(DocumentAnnotatorPipeline.scala:35)
        at cc.factorie.app.nlp.NLP$ServerThread$$anonfun$run$1.apply(NLP.scala:124)
        at cc.factorie.app.nlp.NLP$ServerThread$$anonfun$run$1.apply(NLP.scala:122)
        at scala.collection.Iterator$class.foreach(Iterator.scala:893)
        at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
        at cc.factorie.app.nlp.NLP$ServerThread.run(NLP.scala:122)

So the question is what's the proper way to invoke a server that is capable of doing coreference resolution?

[nopper]

Alternatively could you provide me a with a snippet of scala code capable of doing coreference with NerForwardCoref model? Currently I am using the following code:

    val annotators = Seq(
      app.nlp.segment.DeterministicSentenceSegmenter,
      app.nlp.segment.DeterministicTokenizer,
      app.nlp.pos.OntonotesForwardPosTagger,
      app.nlp.parse.WSJTransitionBasedParser,
      app.nlp.ner.ConllChainNer,
      app.nlp.ner.BilouConllNerChunkAnnotator,
      app.nlp.phrase.ParseAndNerBasedPhraseFinder,
      app.nlp.coref.NerForwardCoref
    )

    val pipeline = app.nlp.DocumentAnnotatorPipeline(annotators:_*)

But unfortunately the system complains about the BILOUChainChunker.factorie model file missing.

[marcocor]

Hi, I am having the same issue -- any update or hint?

I can add that even trying to run the server with the --ner-forward-coref (noun mention coreference), at start I get:

Exception in thread "main" java.lang.Error: No file named Nothing$.factorie found in classpath for class scala.runtime.Nothing$, and no value found in system property scala.runtime.Nothing$. To fix this either add a file with the right name to the classpath or set the system property to point to a directory containing the file.
        at cc.factorie.util.ClasspathURL$.apply(ClasspathURL.scala:42)
        at cc.factorie.util.ModelProvider$$anon$1.<init>(ModelProvider.scala:94)
        at cc.factorie.util.ModelProvider$.classpath(ModelProvider.scala:93)
        at cc.factorie.app.nlp.ner.NoEmbeddingsOntonotesStackedChainNer$.<init>(StackedChainNer.scala:637)
        at cc.factorie.app.nlp.ner.NoEmbeddingsOntonotesStackedChainNer$.<clinit>(StackedChainNer.scala)
        at cc.factorie.app.nlp.DocumentAnnotatorPipeline$$anonfun$13.apply(DocumentAnnotatorPipeline.scala:76)
        at cc.factorie.app.nlp.DocumentAnnotatorPipeline$$anonfun$13.apply(DocumentAnnotatorPipeline.scala:76)
(...many more lines...)

Thanks for any help!

[tribbloid]

I got the same kind of error:

found model

No file named Nothing$.factorie found in classpath for class scala.runtime.Nothing$, and no value found in system property scala.runtime.Nothing$. To fix this either add a file with the right name to the classpath or set the system property to point to a directory containing the file.
java.lang.Error: No file named Nothing$.factorie found in classpath for class scala.runtime.Nothing$, and no value found in system property scala.runtime.Nothing$. To fix this either add a file with the right name to the classpath or set the system property to point to a directory containing the file.
at cc.factorie.util.ClasspathURL$.apply(ClasspathURL.scala:42)
at cc.factorie.util.ModelProvider$$anon$1.(ModelProvider.scala:94)
at cc.factorie.util.ModelProvider$.classpath(ModelProvider.scala:93)
at cc.factorie.app.nlp.ner.ConllChainNer$.(ChainNer.scala:67)
at cc.factorie.app.nlp.ner.ConllChainNer$.(ChainNer.scala)
at cc.factorie.app.nlp.DocumentAnnotatorPipeline$$anonfun$11.apply(DocumentAnnotatorPipeline.scala:74)
at cc.factorie.app.nlp.DocumentAnnotatorPipeline$$anonfun$11.apply(DocumentAnnotatorPipeline.scala:74)
at cc.factorie.app.nlp.DocumentAnnotatorPipeline$.cc$factorie$app$nlp$DocumentAnnotatorPipeline$$recursiveSatisfyPrereqs$1(DocumentAnnotatorPipeline.scala:111)
at cc.factorie.app.nlp.DocumentAnnotatorPipeline$$anonfun$apply$5.apply(DocumentAnnotatorPipeline.scala:123)
at cc.factorie.app.nlp.DocumentAnnotatorPipeline$$anonfun$apply$5.apply(DocumentAnnotatorPipeline.scala:123)
at scala.collection.immutable.List.foreach(List.scala:381)
at cc.factorie.app.nlp.DocumentAnnotatorPipeline$.apply(DocumentAnnotatorPipeline.scala:123)