__forward__impl meaning?

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Hi, Could someone explain why shufflenetV2 code in torchvision need to use __forward__impl?

The explanation in the code say that I can check with TorchScript super().

But I have checked with TorchScript tutorial and have not found that why we need to use __forward__impl().

Is that coupled with TorchScript and can speed up the inference when model is being deployed?

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I found more explanation here.

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