What does face aug do

I looked at the code and it seem that face aug trains on the faces

what i want to know is if it trains on the faces addtionally or if it only trains on the faces also how does the random crop setting relate to this

No file, test, or entry point is named. Trace the Python implementation of face augmentation and the random crop setting, then document whether face augmentation adds to or replaces face training and how random cropping affects it; done means both questions have clear, code-backed answers.

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