从零手写 GPT：逐行代码讲透

Andrej Karpathy builds a GPT from scratch in code, following Attention Is All You Need and GPT-2/3, in about two hours using PyTorch. He connects it to ChatGPT and assumes familiarity with his earlier makemore videos.

Why HN likes it: It is the go-to recommendation for learning how transformers and LLMs actually work, praised for its clarity and Karpathy's teaching.

“the best video I have seen on the topic”