ExpressionNode getExpressionForOutput(String outputName) {
        if (outputName == null && exprPerOutput.size() == 1) {
            return exprPerOutput.values().iterator().next();
        }
        return exprPerOutput.get(outputName);
    }
A named ONNX model that should be evaluated with OnnxEvaluator.

@author lesters
model-evaluation/src/main/java/ai/vespa/models/evaluation/OnnxModel.java