I want to pad a tensor (B, C, H, W) by replicating itself around it. For example, the original tensor is
[[0, 1, 2],
[3, 4, 5],
[6, 7, 8]].
When padding size=2, the expected results is
[[4, 5, 3, 4, 5, 3, 4],
[7, 8, 6, 7, 8, 6, 7],
[1, 2, 0, 1, 2, 0, 1],
[4, 5, 3, 4, 5, 3, 4],
[7, 8, 6, 7, 8, 6, 7],
[1, 2, 0, 1, 2, 3, 4],
[4, 5, 3, 4, 5, 6, 7]].
Furthermore, how can I start convolution at position (2,2) and end at (4,4)?