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Examples of building block with shortcut connections for the residual network (ResNet). (a) Normal block at the C2 stage of the ResNet18 and ResNet34; and (b) bottleneck block at the C2 stage of the ResNet50-ResNet1000. ReLu is rectified linear units; 64-d is depth of 64; and 256-d is depth of 256. The figure was redrawn from He, et al. [29].
