1Cademy - In Multi-Head Attention, each of the $h$ parallel attention heads shares an identical set of projection parameter matrices $W^Q$, $W^K$, and $W^V$.

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Multi-Head Attention Mechanism

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In Multi-Head Attention, each of the $h$ parallel attention heads shares an identical set of projection parameter matrices $W^Q$ , $W^K$ , and $W^V$ .

Updated 2026-09-07

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University of Michigan - Ann Arbor

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In the Multi-Head Attention mechanism, what are the dimensions of the final output projection parameter matrix $W^O$ ?
In Multi-Head Attention, each of the $h$ parallel attention heads shares an identical set of projection parameter matrices $W^Q$ , $W^K$ , and $W^V$ .
What operation is applied to the individual parallel head outputs ( $\text{head}_1, \dots, \text{head}_h$ ) immediately before multiplying them by the parameter matrix $W^O$ ?
Compare Multi-Head Attention to a single attention head in terms of representation capability, and explain how the dimensions chosen for individual heads affect total computational cost.

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