What is an anti_profile model?

[Podidiving]

Hello! In source code there is mentioned anti profile model to determine, whether a face is frontal or not

https://github.com/elyha7/yoloface/blob/4c92a0139ba944f0d7b14f579e1287f2652449a2/face_detector.py#L37

But there is no such file in models folder, nor the mentioning about that in readme

Can you please tell me, what is it and where could it be found?