CODEXCS591 / CS491 · Summer 2026 Sign in

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week 07 · grounded

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Why do we scale by 1/√d_k in attention?

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For large d_k, dot products grow in magnitude and push softmax into regions with vanishing gradients. Dividing by √d_k keeps the scores in a range where softmax stays sensitive12.

1Lecture 07 · Self-attention0:34:102Goodfellow · Reading 9.3pp. 339

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