#backpropagation

Softmax cross-entropy forward and backward, then a training loop
CodingWaymo
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Attention and a small Transformer with a hand-written backward pass
CodingTesla
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Minimal reverse-mode autograd engine
CodingOpenAI
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Neural network forward and backward pass from scratch
CodingAnthropic
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Sharded matrix multiply: forward, backward and planted bugs
CodingHardOpenAI
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