stanfordnlp/CoreNLP · error · UnsupportedOperationException

Not yet implemented

Error message

Not yet implemented

What it means

The SentimentModel constructor derives binary grammar productions from the options. When op.simplifiedModel is false, the constructor is supposed to scan the training trees for actual constituent labels, but that logic was never implemented, so it throws UnsupportedOperationException.

Solutions

1. Set op.simplifiedModel = true so the constructor uses the single "" binary production
2. Implement the missing logic yourself (extract binary productions from the trees) if non-simplified mode is required

Example fix

// before
RNNOptions op = new RNNOptions();
op.simplifiedModel = false;
SentimentModel model = new SentimentModel(op, trainingTrees); // throws
// after
RNNOptions op = new RNNOptions();
op.simplifiedModel = true;
SentimentModel model = new SentimentModel(op, trainingTrees);

if (!op.simplifiedModel) {
  throw new IllegalStateException("SentimentModel constructor only supports simplifiedModel=true");
}
SentimentModel model = new SentimentModel(op, trainingTrees);

try {
  model = new SentimentModel(op, trainingTrees);
} catch (UnsupportedOperationException e) {
  op.simplifiedModel = true;
  model = new SentimentModel(op, trainingTrees);
}

When it happens

Trigger: Constructing a SentimentModel (via new SentimentModel(op, trainingTrees) or similar) with RNNOptions.simplifiedModel set to false.

Common situations: Running sentiment training on custom data with non-simplified options, expecting constituent-label support that the sentiment model never implemented; adapting the model to constituency-labelled trees.

Related errors

• Can only create a model using this method if…
• Cannot create random word vectors for an unknown numHid
• Unknown word vector not specified in the word vector file
• Not sure if RVFDataset runs correctly in this method…
• minValue for feature

AI-assisted analysis of stanfordnlp/CoreNLP@1b7edd19c4 (2026-09-10). Data as JSON: /api/errors/267716c7a3a6a4ed. Report an issue: GitHub.

Appendix: source

Thrown at src/edu/stanford/nlp/sentiment/SentimentModel.java:303

      this.numHid = op.numHid;
    } else {
      int size = 0;
      for (SimpleMatrix vector : wordVectors.values()) {
        size = vector.getNumElements();
        break;
      }
      this.numHid = size;
    }

    TwoDimensionalSet<String, String> binaryProductions = TwoDimensionalSet.hashSet();
    if (op.simplifiedModel) {
      binaryProductions.add("", "");
    } else {
      // TODO
      // figure out what binary productions we have in these trees
      // Note: the current sentiment training data does not actually
      // have any constituent labels
      throw new UnsupportedOperationException("Not yet implemented");
    }

    Set<String> unaryProductions = Generics.newHashSet();
    if (op.simplifiedModel) {
      unaryProductions.add("");
    } else {
      // TODO
      // figure out what unary productions we have in these trees (preterminals only, after the collapsing)
      throw new UnsupportedOperationException("Not yet implemented");
    }

    this.numClasses = op.numClasses;

    identity = SimpleMatrix.identity(numHid);

    binaryTransform = TwoDimensionalMap.treeMap();
    binaryTensors = TwoDimensionalMap.treeMap();
    binaryClassification = TwoDimensionalMap.treeMap();

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