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Research map / Architectures and efficiency / Attention and transformers

Vision Transformers provably learn spatial structure

NeurIPS 2022 · Architectures and efficiency › Attention and transformers · approach: Hybrid and interpretable ViT designs · 7 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Use positional attention, with attention determined only by positional encodings, instead of vanilla attentionViT-tiny-patch16-224 · ImageNettest accuracy: 71.9% -> 68.9%Hurt
Train on permuted rather than original CIFAR-100 imagesViT · CIFAR-100test accuracyNo clear effect
Train on permuted rather than original CIFAR-100 imagesResNet-18 and VGG-19 · CIFAR-100test accuracyMixed
Apply the inverse grid permutation to positional-encoding similaritiesViT trained on permuted CIFAR-100 · CIFAR-100recovery of spatially localized patternsHelped
Train a one-layer ViT on spatially structured data with gradient descentSimplified ViT with positional attention · Synthetic binary classification, idealized population-risk settinggeneralizationHelped
Train with polynomially many samples and Gaussian random initializationSimplified ViT with positional attention · Synthetic binary classification, empirical-risk settinggeneralizationHelped
Pretrain patch association and keep the attention matrix fixed during downstream fine-tuningSimplified ViT; fine-tune the value vector · Downstream data sharing structure but differing in featurestest errorHelped
Use an algorithm without patch-association knowledge instead of the pretrained patch-association modelBinary classification algorithm · Downstream data sharing structure but differing in featurestraining samples needed for test error ≤ o(1)Hurt
Use a generalized linear model without knowledge of the patch partitionGeneralized linear model · Synthetic structured binary classificationclassification errorHurt
Remove spatial structure from the data distributionOne-layer ViT · Gaussian synthetic classificationpatch associationHurt

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