Is it possible to perform both 2d and 3d convolutions in the same deep network?

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MAS
MAS el 29 de Sept. de 2020
Editada: MAS el 30 de Sept. de 2020
I have a set of stereo images, each of size HXWX3. I want to use them and learn transformation between them. I used N branches (by skip connection) of several stride-1 2D convolutions and obtained the corresponding N volumes with HXWXM dimensions. Now, is there any way, so that I can arrange these N volumes in 4D as HXWXMXN, and perform 3D convolutions on it (as shown in the figure with N=2)?
I tried concatenateLayer to merge along dim=4, but it gave an error saying that the expected input size did not match!

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