samoa-api/src/main/java/org/apache/samoa/moa/clusterers/AbstractClusterer.java [87:99]:
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  public void setModelContext(InstancesHeader ih) {
    if ((ih != null) && (ih.classIndex() < 0)) {
      throw new IllegalArgumentException(
          "Context for a Clusterer must include a class to learn");
    }
    if (trainingHasStarted()
        && (this.modelContext != null)
        && ((ih == null) || !contextIsCompatible(this.modelContext, ih))) {
      throw new IllegalArgumentException(
          "New context is not compatible with existing model");
    }
    this.modelContext = ih;
  }
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samoa-api/src/main/java/org/apache/samoa/moa/classifiers/AbstractClassifier.java [93:105]:
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  public void setModelContext(InstancesHeader ih) {
    if ((ih != null) && (ih.classIndex() < 0)) {
      throw new IllegalArgumentException(
          "Context for a classifier must include a class to learn");
    }
    if (trainingHasStarted()
        && (this.modelContext != null)
        && ((ih == null) || !contextIsCompatible(this.modelContext, ih))) {
      throw new IllegalArgumentException(
          "New context is not compatible with existing model");
    }
    this.modelContext = ih;
  }
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