private static void reportWarnings(IntermediateOperation operation, ImportedModel model, Set<String> processed) {
        if (processed.contains(operation.name())) {
            return;
        }
        for (String warning : operation.warnings()) {
            // If we want to report warnings, that code goes here
        }
        for (IntermediateOperation input : operation.inputs()) {
            reportWarnings(input, model, processed);
        }
        processed.add(operation.name());
    }
Add any import warnings to the signature in the ImportedModel.
model-integration/src/main/java/ai/vespa/rankingexpression/importer/ModelImporter.java