Discussion on Reasons behind ResNet Modification

[LiyaoTang]

Thank you guys for such a useful opensource VOT repo. it really helps us understand a lot more on tracking.

Yet, while I am learning the code. I did not understand a few modifications in our ResNet backbone, while I do understand those changes are made to adapt for 255/127 input size.

More specifically, I do not understand the logic behind the following two parts:

1. the padding-dilation logic in BasicBlock and Bottleneck:
   

2. the logic to modify dilation & padding in make_layers(), and it seems the highlighted logic "if" block is used for layer-3 and 4, and "else" block is used for layer-2.
   

The reason why I am interested in this is that I would like to know if the structure can be extended to build ResNet-101 for siamTracker? Or, it is doing logic trick that MAY only work for resnet-50?

Thank you in advance. ;)

[zhengjyu]

Excause me, do you know the reason of the dilation // 2 ?