removing point_nms leads to near 0 AP

[twangnh]

Hi! XinLong, i noted in #33, the point nms is only used to reduce memory usage, but when I try to remove it, the performance drop to near 0, could you please give some advice?

[WXinlong]

@twangnh Hi, I guess you have just removed L163. It's not correct. You can replace that line with cate_pred = cate_pred.sigmoid().permute(0, 2, 3, 1) for removing point nms. You will get 35.9 AP for SOLO_R50_3x model.

[twangnh]

thanks, it works.