Video: Gradient descent, how neural networks learn - Deep learning, part 2 (21 mins)davidbahia (29)in #deep-learning • 7 years ago Gradient descent, how neural networks learn - Deep learning, part 2 (21 mins) . Published on 16 Oct 2017 by 3Blue1Brown But what is a Neural Network? - Deep learning, part 1 #video #youtube #ai