private Integer requireIndexOf(String name) {
        Integer index = indexedBindings.indexOf(name);
        if (index == null)
            throw new IllegalArgumentException("Value '" + name + "' can not be bound in " + this);
        return index;
    }
Returns the set of ONNX models that need to be evaluated on this context
model-evaluation/src/main/java/ai/vespa/models/evaluation/LazyArrayContext.java