Feature refinement module (FRM) points

[Hussni-V]

According to the paper, the FRM samples five vectors per feature point during feature refinement, However, after a closer look in the code I found out that it is only sampling the center point vector and not the other 4 corners. This setting cannot be changed through the config and is not obvious without looking deep into the code.

I just want to ask why the default setting is as such and not as said in the paper?

[DayBreak-u]

I see the code with fr:
scalar_t roi_y = bbox_offset[0] * spatial_scale;
scalar_t roi_x = bbox_offset[1] * spatial_scale;

scalar_t px[5] = { roi_x, 0, 0, 0, 0 };
scalar_t py[5] = { roi_y, 0, 0, 0, 0 };

why roi_y is bbox_offset[0] not bbox_offset[1]?