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I recommend watching Andrej Karpathy's recent videos on backprop and neural nets. Makes it really simple and intuitive.

The spelled-out intro to neural networks and backpropagation: https://www.youtube.com/watch?v=VMj-3S1tku0

Becoming a backprop ninja: https://www.youtube.com/watch?v=q8SA3rM6ckI



Agreed, I learned it from his cs231 visual recognition YouTube lectures, makes it super simple




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