What is fast-pathed or fast-pass functions in Pytorch?

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I am reading pytorch code base and issue to get a better understanding of the design choices. I keep seeing fast-pathed or fast-passed function. I was wondering what these are? For instance, the issue here (https://github.com/pytorch/pytorch/pull/46469).

Thank you in advance!

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I was wondering if anyone is willing to shed some light on this question? Thank you!

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it is a generic designation of execution shortcuts, i.e. skipping code conditionally or by altering function call dispatching