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This is the most step-by-step spelled-out explanation of backpropagation and training of neural networks. It only assumes basic knowledge of Python and a vague recollection of calculus from high school. Links: - micrograd on github: https://github.com/karpathy/micrograd - jupyter notebooks I built in this video: https://github.com/karpathy/nn-zero-to-hero/tree/master/lectures/micrograd - my website: https://karpathy.ai - my twitter: https://twitter.com/karpathy - "discussion forum": nvm, use youtube comments below for now :) - (new) Neural Networks: Zero to Hero series Discord channel: https://discord.gg/3zy8kqD9Cp , for people who'd like to chat more and go beyond youtube comments Exercises: you should now be able to complete the following google collab, good luck!: https://colab.research.google.com/drive/1FPTx1RXtBfc4MaTkf7viZZD4U2F9gtKN?usp=sharing Chapters: 00:00:00 intro 00:00:25 micrograd overview 00:08:08 derivative of a simple function with one input 00:14:12 derivative of a function with multiple inputs 00:19:09 starting the core Value object of micrograd and its visualization 00:32:10 manual backpropagation example #1: simple expression 00:51:10 preview of a single optimization step 00:52:52 manual backpropagation example #2: a neuron 01:09:02 implementing the backward function for each operation 01:17:32 implementing the backward function for a whole expression graph 01:22:28 fixing a backprop bug when one node is used multiple times 01:27:05 breaking up a tanh, exercising with more operations 01:39:31 doing the same thing but in PyTorch: comparison 01:43:55 building out a neural net library (multi-layer perceptron) in micrograd 01:51:04 creating a tiny dataset, writing the loss function 01:57:56 collecting all of the parameters of the neural net 02:01:12 doing gradient descent optimization manually, training the network 02:14:03 summary of what we learned, how to go towards modern neural nets 02:16:46 walkthrough of the full code of micrograd on github 02:21:10 real stuff: diving into PyTorch, finding their backward pass for tanh 02:24:39 conclusion 02:25:20 outtakes :)

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