If it's a machine learning system (which virtually all face recognition systems are as far as I know) it depends more than anything on the training data. It's

If it's a machine learning system (which virtually all face recognition systems are as far as I know) it depends more than anything on the training data. It's just the same as with people: https://en.wikipedia.org/wiki/Cross-race_effect https://en.wikipedia.org/wiki/Cross-race_effect