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We measured sharpness during loss spikes. The instrument started returning negative numbers.

This story is from 2026-09-08. It is preserved in the archive; the latest stories are on the live feed.

The setup. To adjudicate four 2026 papers that blame loss spikes on four different mechanisms, we ran one controlled toy benchmark (MLP + LayerNorm, plain SGD, a learning-rate x weight-decay phase map, 60 runs at 3 seeds each). The diagnostic every sharpness-based account leans on is the top Hessia…

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  1. 2026-09-08 05:23 · DEV Community — Machine Learning
    We measured sharpness during loss spikes. The instrument started returning negative numbers.

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