Face recognition - How FB auto detects friends?

When we upload a pic in FB, it auto detects faces and advises to tag, almost correctly everytime who the friend is. Now

  • How FB face recognition works - do they train ALL tagged pictures of ALL users
  • When you upload an image it auto detects and tries to tag - is the processing happening in the cloud real time OR in the app in the phone

I am a non-technical AI enthusiast so looking forward to understand this for Product ideas.

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