Writing an LLM from scratch, part 34a -- building a JAX training loop for an LLM training run

· · June 30, 2026, 6:06 p.m.
Summary
This blog post details the author's year-long journey of building a large language model (LLM) from scratch using a custom JAX training loop, emphasizing their personal learning experiences, coding challenges, and innovations in model training methods. It covers technical implementations and optimizations, including model architecture, training loops, data handling, and debugging issues, ultimately leading to a functional LLM capable of basic tasks.
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