Build a Large Language Model (From Scratch) by Sebastian Raschka

Build a Large Language Model (From Scratch) by Sebastian Raschka

Ever wondered what's actually happening inside ChatGPT or Claude? This book doesn't just explain it — it walks you through building your own LLM from the ground up, line by line, in Python. No handwaving, no black boxes.

Sebastian Raschka, a leading ML researcher, takes you from tokenization and attention mechanisms all the way to pretraining and fine-tuning a working language model. It's the most hands-on deep dive into LLM internals available today. Read the code. Understand the machine.

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