HackerLet's build GPT: from scratch, in code, spelled out.
Andrej KarpathyYouTube ↗
Further reading 1
Caption notes
Starting with character prediction, build causal attention and Transformer blocks to predict the next token. The resulting toy GPT illustrates a mechanism, not the whole ChatGPT system.
Original passages · 6
trade off the code book size and the sequence lengthsnodes from the future never talk to the Past because they would give away the answertraining an ensemble of sub networks and then at test time everything is fully enabledit takes the model from being a document completer to a question answerergive it the start of a sequence and it completes the sequenceyou can do weighted aggregations of your past Elements