Ensemble method

I am reading a paper named " IEA: Inner ensemble average within a convolutional neural network"https://arxiv.org/abs/1808.10350 and the author proposed a structure as followed

And I am unable to understand the IEA method, because I think the average of the three conv, bn, and relu operations is the same result of one conv, bn, and relu operation.
Can anyone explain it for me? Or give me some sample code to make me understand