Learn to multiply matrices (you can probably Google this). Note that AB != BA in matrix math. Learn derivatives and how to do them with a lookup table. Learn wh

Learn to multiply matrices (you can probably Google this). Note that AB != BA in matrix math. Learn derivatives and how to do them with a lookup table. Learn what log() means (the inverse of some number to a power). That's enough to implement and understand neural networks. You'll fumble around a lot more than you have to, but you can figure it out. Honestly, you could probably fight your way through Ng's class with just matrix multiplication, which you can learn in less than an hour fairly easily.