What is backpropagation and what is it actually doing? | Deep learning, chapter

What's actually happening to a neural network as it learns? Free T-shirt at http://3b1b.co/crowdflower Crowdflower does some cool work and addresses a meaningful need in machine learning, so I was pretty excited that they agreed to sponsor this video. Find the full playlist at http://3b1b.co/neural-networks The following video is sort of an appendix to this one, Thanks to everyone supporting on Patreon. http://3b1b.co/nn3-thanks http://3b1b.co/support For more on backpropagation: http

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