junrushao1994 edited a comment on issue #12078: [MXNET-749] Correct usages of `CutSubgraph` in 3 control flow operators URL: https://github.com/apache/incubator-mxnet/pull/12078#issuecomment-411505008 @zheng-da I agree it is expensive. We need to ensure all output nodes of the symbol fed to CutGraph to have the same sub graph name, so not only should we check existence of `__subgraph_name__`, but also should check if they are equal. But currently we have not ensured all subgraphs have different names though...So correctness comes first.
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