The exact mapping between the channel index of the mask and the coordinate of the modulated kernel

[YingqianWang]

Thanks a lot for your released codes of DCNv2. I have the following question. For a NxN modulated deformable convolution, its mask has N^2 channels. I want to know the exact mapping between the channel index of the mask and the coordinate of the modulated kernel. Is the mapping like this: [0, 1, 2, 3, 4, ..., N^2] --> [[0, 0], [0, 1], [0, 2], ..., [N, N]]?

Hoping that you can help me with this problem. Looking forward to your early reply. Thanks a lot!