Diagram of mixed-precision AdamW with ZeRO-1 sharding across GPUs.

Building Mixed-Precision AdamW with ZeRO-1 from Scratch in Pure PyTorch

A runnable, from-scratch implementation of mixed-precision AdamW with dynamic loss scaling and ZeRO-1 sharded optimizer state in pure PyTorch — built to demonstrate real systems engineering, not just model design.

September 6, 2026 · 12 min · 2453 words · martinuke0
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