Add one new paper in object detection~

[implus]

Generalized Focal Loss V2: Learning Reliable Localization Quality Estimation for Dense Object Detection

Paper: https://arxiv.org/abs/2011.12885
Code: https://github.com/implus/GFocalV2
Zhihu: https://zhuanlan.zhihu.com/p/147691786

[implus]

Thanks a lot~

[52CV]

My pleasure~