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Discovery of a Structured Bug in Periodic Rollouts

2/4 The weird part: the spikes were periodic. When we increased rollouts per prompt, the spike pattern moved with them. That was the clue that this wasn't "training instability", it was a structured rollout-path bug. [Translated from EN to English]

→ View original post on X — @ai21labs, 2026-03-26 11:42 UTC