THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Figure 2. Flowchart for subgraph replace.
Flowchart for our parallel op pass as As Fig.2 shows. We implement it shown, we implement the whole workflow based on subgraph API. SgParallelOpSelector inherits `SgParallelOpSelector` inherited from SubgraphSelector `SubgraphSelector` is used to find the parallel structure, and SgParallelOpProperty inherits `SgParallelOpProperty` inherited from SubgraphProperty `SubgraphProperty` is to connect its input/output entry.
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