CBNet Paper Layers composition

[aliceinland]

Hi! I was reading the paper and I did not understand a part of the network.
Which is the operation that is performed between the layers of the second backbone network?
Let me better explain: the + inside the circle perform a sum operation? And how these operations are performed?

Thank you.

[tingtingliangvs]

Hi, for each color line, there is a 1x1 conv+bn layer to adjust the channel dimension. And yes, the + inside the circle performs a sum operation. Details can be found in cbnet.py