# 📉 Phase 4 — MuSGD


## WP-033 — toy convergence golden

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MuSGD reaches the 0.1 MSE threshold in **47 steps against momentum-SGD's 90** on a fully seeded micro-CNN regression task.

The tolerance is the interesting part: step counts are pinned at **±15**, final losses at 0.005. Cross-platform torch float drift shifts trajectories slightly ([Float reproducibility](https://borda.github.io/lucid-YOLO/engineering/cross-cutting/#cross-float)), so a tight pin would be a golden about the machine. The 43-step separation is what keeps the *directional* claim decisive inside a tolerance that loose — the golden asserts the ordering it cares about rather than the number it happened to get.