@zheng-da If we don't need more than 1 subgraph in a node, why we define subgraphs as a vector? @reminisce If subgraph is produced and handled by each backend itself, then each backend can decide its subgraph sequence. But the thing is, we need to add code to common part to handle all subgraphs from various backends. This part change is an example. So it's better to have such a rule that all backends to follow, and then we can make check based on that.
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