Overview

Build a DeepSeek Model from Scratch addresses a hard truth many AI engineers face today: most resources explain what large language models are, but very few show how to actually build one that scales, stays stable, and performs competitively under real-world constraints. If you've tried to move beyond toy models-only to hit walls around memory limits, training instability, slow attention, or runaway costs-this book is written for you. This book delivers a complete, production-minded blueprint for designing and training DeepSeek-class large language models from the ground up. It walks through the full lifecycle of modern LLM engineering: defining an efficient decoder-only architecture, integrating Mixture of Experts for scale, enabling long-context reasoning with efficient attention, and deploying models that can be served reliably and cost-effectively. Every design choice is explained from an engineering perspective, grounded in practices that work at billion-parameter scale. You'll learn how to move from architectural intent to operational reality-without hand-waving, fragile shortcuts, or purely academic abstractions. By the end of this book, you'll be able to: Design a DeepSeek-style LLM architecture optimized for throughput, memory, and cost Implement and scale Mixture of Experts layers without load collapse or routing instability Train long-context models using efficient attention and KV cache strategies Build streaming data pipelines that scale cleanly and remain reproducible Stabilize billion-parameter training with the right optimizers, precision, and recovery workflows Evaluate reasoning, language, and code performance without benchmark overfitting Deploy and serve large models using quantization and modern inference patterns Written for AI engineers, ML researchers, and systems builders, this book emphasizes practical execution over theory and replaces guesswork with tested engineering patterns. It assumes you want to build, not just experiment-and that reliability, performance, and scalability matter as much as raw capability.

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