2022-11-15 Don’t use id(node)

I was expecting the following code to be produce unique keys. But it seems python objects for the nodes are created one the fly and destroyed in the same loop. Then id(node) are not unique.

for node in onnx_model.graph.node:
    key = id(node)

It is also not sure that the same loop would produce the same results if run a second time later in the code.