How do you crop faces exactly?

[nkkbr]

Hi, thanks for your great work!

I’d like to ask about the face cropping process.
How exactly do you crop faces in your preprocessing or training pipeline?

If my own face cropping method is different from the one used when preparing your training data, could that cause a drop in model performance?
I’d really appreciate it if you could share more details about your specific face cropping procedure.

Thanks in advance!