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id,confidence=recognizer.predict(gray[y:y+h,x:x+w]) confidence=100*(1-(confidence)/300))

what is this calculation i did'nt understand this formula to get confidence value maximum

Ex:

id,confidence=recognizer.predict(gray[y:y+h,x:x+w])
confidence=100*(1-(confidence)/300))
confidence=100*(1-(confidence)/300))

what is this calculation i did'nt understand this formula to get confidence value maximum