The size of resnet is not the same as described in config file

[xllau]

The config file describes the stride is BACKBONE_STRIDES = [4, 8, 16, 32, 64] which corresponding to C1, C2, C3, C4,C5. But when I realize the code, size(C1)=size(C2)= 1/4 size(input)? how can explain this?