Sebastian Raschka 9/6/2025

Understanding and Implementing Qwen3 From Scratch

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This technical article provides a detailed, code-first guide to understanding and building the Qwen3 LLM architecture from the ground up. It covers the model's dense and Mixture-of-Experts (MoE) variants, discusses its performance and licensing advantages, and offers reusable PyTorch building blocks for developers to adapt in their own projects.

Understanding and Implementing Qwen3 From Scratch

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