Face Verification using MLKIT Vision

Question

Hi,

Iam developing an android app using MLKIT  Vision for face detection. 

- I can able to detect the user faces using mlkit vision  and store the detected faces in internal storage.

Now i want to verify the user faces with stored faces like. If a user opens the app starting capturing the user face and i want to verify with the stored face.

How to verify the two faces are identical or not using the MLKIT vision?