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Demystifying LLMs: Building a 124M-Parameter Decoder-Only Transformer in PyTorch

If you want to understand how modern Large Language Models work, reading about them is useful — but building a small one yourself makes the concepts much more concrete. In this project, we'll build a GPT-2-style decoder-only Transformer from scratch in PyTorch , train it on the TinyStories dataset,…

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  1. 2026-09-30 19:19 · DEV Community — Machine Learning
    Demystifying LLMs: Building a 124M-Parameter Decoder-Only Transformer in PyTorch

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