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Why Adaptive Optimizers Underestimate Rare Tokens

Kar, Sangsidhya
arXiv (All) · Papers
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In the softmax output layer, a rare token receives a small positive logit gradient on most steps and a much larger negative gradient on the few steps when it is the target. SGD simply adds these contributions. Coordinate-wise adaptive methods such as Adam, RMSProp, and sign descent instead divide ea
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