Sebastian Raschka • 9/6/2025

Understanding and Implementing Qwen3 From Scratch

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This technical article provides a comprehensive, code-first implementation of the Qwen3 LLM architecture using PyTorch. It covers both dense and Mixture-of-Experts variants, explaining the building blocks through practical coding examples rather than conceptual diagrams alone. The author discusses Qwen3's popularity due to its Apache 2.0 license and competitive performance against proprietary models.

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#llm #Pytorch #Transformer
Understanding and Implementing Qwen3 From Scratch

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