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One-Layer Transformer Provably Learns Multiclass One-Nearest Neighbor in Context

Athreya, Skanda et al.
arXiv (All) · Papers
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machine-learning
We extend recent work establishing an equivalence between one-layer transformers and nearest-neighbor classifiers in the binary setting to the multiclass case. By leveraging the simplex encoding, we show that one-layer transformers with an argmax classification head behave identically to a one-neare
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