void addInputMapping(String onnxName, String source) {
        if (evaluator != null)
            throw new IllegalStateException("input mapping must be added before load()");
        inputSpecs.add(new InputSpec(onnxName, source));
    }
A named ONNX model that should be evaluated with OnnxEvaluator.

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