Are the 4 IARBs in the bottleneck structure connected in series?

[yunchao-ding]

Hi, If it is in series, will the second IARB take the output information from the first IARB as input, and then repeat the steps in the first IARB? If not a series structure, what structure is it? Can you explain the specific steps? The paper does not specify how the four IARBs are connected.