some questions about ”get_bboxes“ in "grid_head.py" file

[zimenglan-sysu-512]

hi @siyuanren why do u get grid_points by dividing 2W instead of W in these two lines? and what do these lines do as below?

        for i in range(9):
            xs[i::9] = xs[i::9] + base[i//3]
            ys[i::9] = ys[i::9] + base[i%3]

[luxiin]

Hi, @zimenglan-sysu-512 . The codes you point out are the implementation of Grid Point Specific Representation Region proposed in Grid R-CNN Plus. You can refer to section 3.1 in https://arxiv.org/pdf/1906.05688.pdf for more details.