Deformable groups - support and explanation

[jsaric]

Hi, thank you for your work!
Is deformable_groups parameter now supported in deformable convolutions?
Could you please precisely explain what happens If I set it do !=1?
I wonder if each group has different kernel weights and different offsets or kernel weights across groups are shared and offsets are not?

[hellock]

deformable_groups refers to the offset groups (as described in the DCN paper), and groups refers to the convolution groups (just the same as group convolution, which is not implemented in the original DCN paper). You may refer to the paper for more details.

[alexwq100]

@hellock ，so deformable_groups must be equal to the groups ?