Wonderful example of the ethics of ML. The people whose eyes they tracked gravitated towards certain kinds of faces (not necessarily just based on skin colour), so now Twitter's model crops other faces out of pictures, among other problems (now it likes cleavage apparently).<p>The old approach may have been a bit mechanical but it avoided the non-neutrality of unconscious human perception.
The assumption that what human eyes gravitate to is what an image should be cropped to is a very big and questionable one. The first thing I look at in a picture is not always the most important part, and the image as a whole has value.