feature pyramid network 

Lin, Tsung-Yi, et al. "Feature pyramid networks for object detection." Proceedings of the IEEE conference on computer vision and pattern recognition. 2017.   (FPN)

Chao, Hanqing, et al. "Gaitset: Regarding gait as a set for cross-view gait recognition." Proceedings of the AAAI Conference on Artificial Intelligence. Vol. 33. 2019.

Tan, Mingxing, Ruoming Pang, and Quoc V. Le. "Efficientdet: Scalable and efficient object detection." arXiv preprint arXiv:1911.09070 (2019).   (BiFPN,    Google, Brain Team)

Loss function

Focus loss---cope with imbalance data   Lin, T.Y., Goyal, P., Girshick, R., He, K., Doll′ar, P.: Focal loss for dense object detection. In: Proc. ICCV. pp. 2980-2988 (2017)