How to visualize the non-local operation from the input？

[ch47]

In the paper, the non-local blocks are sometimes inserted into the middle of the network, for example, in res3. How to visualize the connection between different positions in the input vedio (like a 32-frame input with a stride of 8 frames in this paper), while the non-local blocks are at several layers behind?

[ch47]

The input size of res3 (where the non-local blocks are inserted) is 4×56×56, while the input is 32×224×224.