Sebastian Raschka is a German-American machine-learning researcher (Lightning AI), University of Wisconsin-Madison faculty alumnus, and one of the most widely cited textbook authors in modern ML. His books — Python Machine Learning, Build a Large Language Model (From Scratch), and Build a Reasoning Model (From Scratch) — anchor the from-scratch implementation track in the field.
His CourseFlix listing carries three Sebastian Raschka courses: Build a Large Language Model (From Scratch), Master and Build Large Language Models, and Build a Reasoning Model (From Scratch). Material is paid and aimed at engineers and researchers who want to understand the math and code underneath modern LLMs rather than treat them as black boxes.
