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Sebastian Raschka

LLM research engineer and author of Build a Large Language Model (From Scratch); formerly at Lightning AI

Sebastian Raschka is an LLM research engineer whose recent work, according to Raschka's site, centers on LLM architectures and small-scale training, with an interest in inference and evaluation. Raschka is the author of Build a Large Language Model (From Scratch) and its sequel, Build a Reasoning Model (From Scratch); the first book's official code repository implements, pretrains and fine-tunes a GPT-like model in PyTorch and is designed to run on conventional laptops. Raschka's site describes earlier roles as a senior engineer at Lightning AI and as a statistics professor at the University of Wisconsin-Madison.123

Work

  • LLMs-from-scratch (external site: github.com)Open-source code

    Official code repository for Raschka's book Build a Large Language Model (From Scratch), containing code for developing, pretraining and fine-tuning a GPT-like LLM in PyTorch without external LLM libraries; the main chapter code is designed to run on conventional laptops. Licensed under Apache-2.0.341

Earlier roles

  • Senior engineer, Lightning AI12
  • Statistics professor, University of Wisconsin-Madison12

This profile covers public professional work only, from the sources below. It is not an endorsement or a ranking. To correct or remove it, use the correction form.

Sources · reviewed Oct 13, 2026

  1. 1.
    Sebastian Raschka — homepage (external site: sebastianraschka.com)

    Sebastian Raschka · Official page · accessed Oct 13, 2026

  2. 2.
    Sebastian Raschka — about (external site: sebastianraschka.com)

    Sebastian Raschka · Official page · accessed Oct 13, 2026

  3. 3.
    rasbt/LLMs-from-scratch README (external site: github.com)

    Sebastian Raschka (GitHub repository) · Repository · accessed Oct 13, 2026

  4. 4.
    rasbt/LLMs-from-scratch LICENSE.txt (Apache-2.0) (external site: github.com)

    Sebastian Raschka (GitHub repository) · License · accessed Oct 13, 2026

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