Skip to content "You’ve taken this idea way too far," a mentor told Prof. Fei-Fei Li. Credit: Aurich Lawson | Getty Images Credit: Aurich Lawson | Getty Images During my first semester as a computer science graduate student at Princeton, I took COS 402: Artificial Intelligence. Toward the end of the semester, there was a lecture about neural networks. This was in the fall of 2008, and I got the distinct impression—both from that lecture and the textbook—that neural networks had become a backwate...