Minimal single-token substitutions in BERT show that common tokens induce small embedding shifts, rare tokens induce larger shifts, and perturbation effects grow with layer depth, which the authors interpret as support for early-layer explanations.
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Probing the Embedding Space of Transformers via Minimal Token Perturbations
Minimal single-token substitutions in BERT show that common tokens induce small embedding shifts, rare tokens induce larger shifts, and perturbation effects grow with layer depth, which the authors interpret as support for early-layer explanations.