Momentum SGD pays a provable tracking penalty under distribution shift — lag growing as (1−β)⁻¹ and tracking floors worse than vanilla SGD in drift-dominated regimes.
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On the Provable Suboptimality of Momentum SGD in Nonstationary Stochastic Optimization
Momentum SGD pays a provable tracking penalty under distribution shift — lag growing as (1−β)⁻¹ and tracking floors worse than vanilla SGD in drift-dominated regimes.