Build a Reasoning Model (From Scratch), Video Edition
Published 6/2026
By Sebastian Raschka
MP4 | Video: h264, 1280x720 | Audio: AAC, 44.1 KHz, 2 Ch
Genre: eLearning | Language: English + subtitle | Duration: 9h 16m | Size: 2 GB
"An exceptional deep dive into the next frontier of AI."
Build a Reasoning Model (From Scratch) is a practical guide to understanding how modern reasoning-oriented LLMs work by building their core methods step by step. The book tells a clear engineering story: start with a conventional pre-trained LLM, learn how text generation works, build reliable evaluation tools, improve reasoning through inference-time methods, then move into training-based approaches such as reinforcement learning and distillation.
The progression is deliberate. Early chapters establish the baseline model and explain text generation, KV caching, and evaluation with math verifiers. The middle chapters show how reasoning can be improved without changing model weights, using chain-of-thought prompting, sampling, self-consistency, response scoring, and self-refinement. Later chapters move to changing the model itself through reinforcement learning with verifiable rewards, GRPO improvements, format rewards, and finally distillation from stronger reasoning models into smaller ones.
The book is especially useful because it implements the core methods from scratch rather than treating them as black-box library calls. Readers see how self-consistency, self-refinement, Best-of-N, and training-based methods actually work, including their cost and latency trade-offs. It also discusses common failure modes, including cases where refinement can make answers worse. Difficult concepts such as softmax, temperature, and top-p sampling are clarified with code-linked explanations and diagrams, and visual workflows make pipelines and scoring methods easier to follow.
Reading the book feels like following a guided technical build rather than a loose survey of AI topics. Each concept is introduced because the project now needs it. Diagrams, roadmaps, code listings, exercises, and repeated workflow summaries help readers stay oriented through advanced material. This structure reflects
Sebastian Raschka's
professional strength: explaining complex machine learning topics by making every detail concrete and showing exactly where each section fits in the larger story. He does not treat mechanisms like evaluation, log-probabilities, KL regularization, or distillation as isolated abstractions; he connects them to the goal of making reasoning models understandable and implementable.
Physically and organizationally, the book has eight chapters and seven substantial appendixes. That design keeps the main narrative focused while moving supporting material like references, exercise solutions, model source code, larger models, batching, evaluation alternatives, and chat interfaces into ordered appendixes. The result is a logically flowing book that remains hands-on, navigable, and technically deep without constantly interrupting the central build.
What's Inside
From-scratch implementations of core LLM reasoning improvements Verifier-based evaluation methods RL with automatic verifiers for mathematics tasksAbout the Reader
For readers who know Python and have some knowledge of machine learning.
About the Author
Sebastian Raschka
is an LLM Research Engineer with over a decade of experience. He is the author of the bestselling book Build a Large Language Model (From Scratch).
Quotes
Distills the profound ideas in the clearest, most accessible way.- Byron Hsu, LMSYSBig. Dope. Great read, fun writing.- Chris Alexiuk, NVIDIAThe gold standard for developers wanting to build at the cutting edge of AI.- Omar Sanseviero, Author of Hands-On Generative AI with Transformers and Diffusion ModelsA really well-structured, hands-on introduction to reasoning models!- Vinija Jain, GoogleAn excellent starting point, accessible even to readers with little or no prior working experience with LLMs.- Arun Prakash, AI4BharatDemystifies reasoning models by providing practical, hands-on implementations of cutting-edge techniques.- Fabio Montagna, GraphAwareIt doesn't stay at theory-it walks you from sampling to scoring to iterative refinement with actual code.- Toni Ramchandani, MSCI Inc.
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