Physics-style analysis maps loss spike phase diagram, hints beta1=beta2 optimal
ZimingLiu11 · x · 2026-11-01
Ziming Liu's thread wraps up a physics-style analysis of training loss spikes:
- The team maps a loss spike phase diagram in the (beta1, beta2) plane, offering practical guidance for avoiding spikes in large-scale training.
- The quadratic toy model is seriously wrong for understanding spikes; they propose a core-wall-rollover toy model that better reflects reality.
- Training losses may mix multiple mechanisms—Adam stability is just one. Their analysis complements Jianlin Su's mathematical argument that beta1 = beta2 may be the optimal choice.
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