How to load more than one trained face recognizer in one face recognizer open CV?

Question

I am trying to train face recognizer but I don't want to train every time a new user data is entered in face database so I want to train new user data and then concatenate with previous trained recognizer. I have two trained recognizer I want to concatenate these two.

Any help in this regard would be appreciated.

This is my code I am reading from three recognizer and want to save them to one:

face_recognizer1=my.facerecognizer(cv2.face_LBPHFaceRecognizer.create()) 
face_recognizer1.read("trainer"+"/"+"s1"+".xml")
face_recognizer1.read("trainer"+"/"+"s2"+".xml")
face_recognizer1.read("trainer"+"/"+"s3"+".xml")
face_recognizer1.save("trainer"+"/"+"s11"+".xml")

Answer 1

i have found a solution, use update to update recognizer. more details at opencv docs facerecognizer