Resolve Coreference using Stanford Parser in .NET

Question

Basically what I want is to replace all the pronouns from a text with the actual entity.

        // Path to the folder with models extracted from `stanford-corenlp-3.7.0-models.jar`
        var jarRoot = ...

        // Text for processing
        var text = "Kosgi Santosh sent an email to Stanford University. He didn't get a reply.";

        // Annotation pipeline configuration
        var props = new Properties();
        props.setProperty("annotators", "tokenize, ssplit, pos, lemma, ner, parse, dcoref");
        props.setProperty("ner.useSUTime", "0");

        // We should change current directory, so StanfordCoreNLP could find all the model files automatically
        var curDir = Environment.CurrentDirectory;
        Directory.SetCurrentDirectory(jarRoot);
        var pipeline = new StanfordCoreNLP(props);
        Directory.SetCurrentDirectory(curDir);

        // Annotation
        var annotation = new Annotation(text);
        pipeline.annotate(annotation);

        var graph = annotation.get(new CorefChainAnnotation().getClass());
        Console.WriteLine(graph);

So far I could only find how to "pretty print" it, but I would like to further process the result from "graph", yet I do not know how to actually parse the result from "annotation.get(new CorefChainAnnotation().getClass())". In Java it is said that it would return a Map < Integer, CorefChain >, but I don't know how it is supposed to work in C#.

Do you have any ideas?

score 0 · Answer 1 · answered Aug 28 '17 at 04:59

Once you have the annotation, you get the graph by casting it.

Map graph = (Map)document.get(new CorefCoreAnnotations.CorefChainAnnotation().getClass());
var entrySetValues = graph.entrySet();
Iterator it = entrySetValues.iterator();
while (it.hasNext())
{
     Map.Entry kvpair = (Map.Entry)it.next();
     CorefChain corefChain = (CorefChain)kvpair.getValue();
     var mentionsList = corefChain.getMentionsInTextualOrder() as ArrayList;
     foreach (CorefMention mention in mentionsList)
     {
          string noun = mention.mentionSpan;
          // do other stuff
     } 

     it.remove();
}

For C#, the idea is to first cast an object correctly, get the list from the cast object as an ArrayList, Loop on the arraylist and cast the objects correctly again.

Resolve Coreference using Stanford Parser in .NET

1 Answers1