But what *is* a Neural Network? Deep learning, Part 1

Subscribe to stay notified about part 2 on backpropagation: http://3b1b.co/subscribe Typo correction: At 14:45, the last index on the bias vector is n, when it's supposed to in fact be a k. Thanks for the sharp eyes that caught that! For those who want to learn more, I highly recommend the book by Michael Nielsen introducing neural networks and deep learning: https://goo.gl/Zmczdy There are two neat things about this book.