About depth of RoI-wise subnetwork

[sjtuxcx]

Hi, I find in the implementation the RPN's input is from resnet layer4 not layer5+new conv(see protxt file) but origin paper said depth of RoI-wise subnetwork is 0. I am confused. In Faster RCNN RPN and ROI pooling do not share the same feature but in R-FCN they should share the same feature. Does anyone can answer the question? Thanks very much!