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Rectifying the Shortcut Learning of Background for Few-Shot Learning

NeurIPS 2021 · Label-efficient and robust learning › Zero-/few-shot and meta-learning · approach: Embedding adaptation for few-shot classification · 45 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
remove background at evaluation (use foreground crops) (ablation)CC trained on Ori · miniImageNet subset 5-shotaccuracy: 62.73 -> 66.75Helped
train on foreground-only instead of original images, evaluate on Ori (ablation)CC · miniImageNet subset 5-shot Dv-Oriaccuracy: 62.73 -> 60.85Hurt
fusion sampling of foreground and original images at training (ablation)PN · miniImageNet subset 5-shot Dv-Oriaccuracy: 52.74 -> 59.23Helped
add COS foreground-aware training sampling (ablation)CC · miniImageNet 1-shot Dv-Oriaccuracy: 62.67 -> 64.76Helped
finetune from contrastive pretrained model instead of scratch (ablation)CC+COS · miniImageNet 5-shot Dv-Oriaccuracy: 81.18 -> 81.16No clear effect
add SOC evaluation alone without COS (ablation)CC+FT · miniImageNet 1-shot Dv-Oriaccuracy: 62.71 -> 64.41Mixed
add SOC on top of COS (ablation)CC+FT+COS · miniImageNet 1-shot Dv-Oriaccuracy: 65.05 -> 69.29Helped
replace COS with RBD saliency foreground extraction in training (ablation)CC · miniImageNet 1-shotaccuracy: 62.67 -> 63.24Helped
replace COS with MBD saliency in training (ablation)CC · miniImageNet 1-shotaccuracy: 62.67 -> 61.50Hurt
replace SOC with RBD saliency crops at evaluation (ablation)COS · miniImageNet 1-shotaccuracy: 69.28 -> 67.03Hurt
replace contrastive Exemplar with supervised CC, eval on FG only (ablation)miniImageNet training · miniImageNet 5-shot Dv-FGaccuracy: 85.12 -> 82.86Hurt
vary SOC importance factors alpha, beta toward 0 or 1 (ablation)SOC · miniImageNetaccuracyHurt

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