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cs.LG updates on arXiv.org

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Analogies between Transformer Layers and Power Method
[Submitted on 25 May 2026] · 2026-05-26 · via cs.LG updates on arXiv.org

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Abstract:In the paper we show that there is an analogy between the operations occurring in a layer of a transformer (projections and layer normalizations, disregarding the feedforward neural network) and a step in the power method. Coherently with this analogy, we show that passing through a layer the tokens tend to be tilted towards the principal eigenvector of a matrix which is the product of the output and value weight matrices of that layer. In the special case of a transformer with shared weights (i.e., in which all layers have identical weights) then the alignment with this principal eigenvector is particularly evident empirically, and can also be shown analytically. The analogy also suggests a method to steer the output of the transformer towards an arbitrary desired direction in token space.

Submission history

From: Chenglong Li [view email]
[v1] Mon, 25 May 2026 09:20:41 UTC (4,193 KB)