AttributeError: 'module' object has no attribute 'face'

I installed openCV on my pi following this install guide https://www.murtazahassan.com/opencv-raspberry-pi-installation/

My goal is to use facial recognition however I am having no luck getting it to work.

recognizer = cv2.face.LBPHFaceRecognizer_create()

which throws the following error:

AttributeError: 'module' object has no attribute 'face'

I also ran the following command to install opencv-contrib-python:

sudo pip3 install opencv-contrib-python==4.1.1.26

also, no luck unless there is something else I need to run to get it to work?

Please be aware I am new to the python and raspberry community.