AI visionary who teaches humans to teach computers

Andrew Ng has led teams at Google and Baidu that have gone on to create self-learning computer programs used by hundreds of millions of people, including email spam filters and touch-screen keyboards that make typing easier by predicting what you might want to say next. As a way to get machines to learn without supervision, he has trained them to recognize cats in YouTube videos without being told what cats were. Now he claims he wants to'free humanity' using AI technology - and hopes to create a system that learns like a child. Scientist Andrew Ng, right, works with others at his office in Palo Alto, Calif. Ng, one of the world's most renowned researchers in machine learning and artificial intelligence, is facing a dilemma: there aren't enough experts trained to train the machines.