The Definition of Machine Learning

A clear example of a scenario in which the manual process would fail is in the detection of faces in images. Today, a phone can detect a face in an image. But face detection was an unsolved problem in 2001. The main problem is the way pixels (which build an image on a computer) are perceived by the computer is very different from how humans perceive faces. This difference in representation makes it virtually impossible for a human to create a good set of rules.