Non-normality in linearized optimizer update operators yields a pseudospectral bound where κ(V) warns of transient amplification before spectral radius indicates instability.
and Trefethen, Anne E
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Non-normal spectral signatures of instability in neural network training dynamics
Non-normality in linearized optimizer update operators yields a pseudospectral bound where κ(V) warns of transient amplification before spectral radius indicates instability.