What is significance of "Person-Group" in Microsoft Cognitive service Face API?

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I am using Microsoft Cognitive service Face API for face detection. While Working I see we need to create person group and creating person group is mandatory for identifying person. I check about the "Person-Group" a lot but didn't get anything. Can you please help me out to know what's the actual use & significance of "Person-Group".

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cthrash On

For face identification/verification, you scope the search to the set of Person objects. This set is called a PersonGroup. In computer vision terms, the PersonGroup is the image classifier unit, and is trained from the faces of the Person objects contained therein.