[derekam]

Exactly. There was some fuss a while back about a similar classifier for sexuality. It turned out to be guessing mostly based on head tilt, personal hygiene and whether the person was wearing glasses. The physiognomy component was ~nonexistent even though it was publicized as though it weren’t. People intentionally if at times subconsciously present themselves in a way that signals information to kindred spirits. You’d need to bring in hundreds of people, wash them and basically take mugshots to control for that.

[jfengel]

I think that conclusion is at least as interesting as physiognomy. It's remarkable that a computer could be more sensitive to it than people.

[Nasrudith]

People don't get confirmation of those details normally unlike the ML algorithm. Of course we don't lock people in boxes with a stack of training set photos for a period of time equivalent to ML training.