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Knowledge Distillation With the Reused Teacher Classifier

CVPR 2022 · Label-efficient and robust learning › Knowledge distillation · approach: Rethinking distillation objectives · 231 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Reuse the teacher classifier and train the student encoder with feature alignmentStudent networks distilled from larger teachers · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 76.23 $\pm$ 0.04 -> 78.08 $\pm$ 0.15Helped
Add SimKD to CMI data-free distillationCMI · CIFAR-100 data-free KD, WRN-40-1 studenttop-1 accuracy (%): 64.80 $\pm$ 0.35 -> 66.78 $\pm$ 0.29Helped
Replace the default three-layer projector with 1x1Conv (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 75.15 $\pm$ 0.27Hurt
Replace the default projector with two 1x1Conv layers (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 75.71 $\pm$ 0.33Hurt
Replace 3x3 convolution in the projector with depthwise convolution (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 77.76 $\pm$ 0.12Hurt
Align feature vectors rather than using last feature maps (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 76.03 $\pm$ 0.40Hurt
Move feature alignment from before to after the teacher classifier (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 77.09 $\pm$ 0.09Hurt
Add output feature loss to input feature alignment loss (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 77.88 $\pm$ 0.30Hurt
Reuse the teacher classifier plus its last building block (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 78.47 $\pm$ 0.08Helped
Reuse the teacher classifier plus its last two building blocks (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 78.88 $\pm$ 0.05Helped
Increase the projector reduction factor from r=2 to r=8 (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teachertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 76.73 $\pm$ 0.20Hurt
Jointly train the student encoder and classifier with KD and feature-alignment losses (ablation)SimKD · CIFAR-100, ResNet-8x4 student and ResNet-32x4 teacher; reused teacher classifiertop-1 accuracy (%): 78.08 $\pm$ 0.15 -> 73.91 $\pm$ 0.12 (α=0.2)Hurt

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