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Selective Kernel Networks

CVPR 2019 · Architectures and efficiency › CNN design · approach: Large and dynamic kernel design · 3,142 citations (OpenAlex)

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Measured effects reported in the paper

What was changedWhereMeasuredEffect
Replace ResNeXt bottleneck convolutions with SK convolutions using adaptive kernel selectionResNeXt-50 · ImageNet validation, 224×224top-1 error (%): 22.23 -> 20.79Helped
Replace ResNeXt bottleneck convolutions with SK convolutions using adaptive kernel selectionResNeXt-101 · ImageNet validation, 224×224top-1 error (%): 21.11 -> 20.19Helped
Replace 3×3 depthwise convolutions with SK unitsShuffleNetV2 · ImageNet validation, single 224×224 croptop-1 error (%): 38.41 -> 35.35; 30.57 -> 28.36Helped
Use SK convolution in place of the ResNeXt grouped convolutionResNeXt-29, 16×32d · CIFAR-10 testtop-1 error (%): 3.87 -> 3.47Helped
Use SK convolution in place of the ResNeXt grouped convolutionResNeXt-29, 16×32d · CIFAR-100 testtop-1 error (%): 18.56 -> 17.33Helped
Use SK attention instead of simple summation across different kernel paths (ablation)SKNet-50 with K3 and K5 · ImageNet validationtop-1 error (%): 21.76 -> 20.79Helped
Add a second, different-sized kernel path (ablation)K3-only model · ImageNet validationtop-1 error (%): 22.23 -> 21.76Helped
Add SK attention to K3 and K7 paths (ablation)SKNet-50 · ImageNet validationtop-1 error (%): 21.82 -> 20.97Helped
Add SK attention to K5 and K7 paths (ablation)SKNet-50 · ImageNet validationtop-1 error (%): 23.64 -> 23.09Helped
Add a third K7 path to an SK model using K3 and K5 (ablation)SKNet-50 · ImageNet validationtop-1 error (%): 20.79 -> 20.76Helped
Use a 7×7 second-branch kernel instead of the selected 5×5 effective kernel (ablation)SKNet-50 · ImageNet validationtop-1 error (%): 20.79 -> 21.18Hurt
Use dilation 3 rather than dilation 2 in the second 3×3 branch (ablation)SKNet-50 · ImageNet validationtop-1 error (%): 20.79 -> 20.97Hurt

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