a2d2: semantic segmentation

References

• Olaf Ronneberger, Philipp Fischer, Thomas Brox. U-Net: Convolutional Networks for Biomedical Image Segmentation. MICCAI, 2015. https://arxiv.org/abs/1505.04597
• Hamid Rezatofighi, Nathan Tsoi, JunYoung Gwak, Amir Sadeghian, Ian Reid, Silvio Savarese. Generalized Intersection over Union: A Metric and A Loss for Bounding Box Regression. CVPR, 2019. https://arxiv.org/abs/1902.09630
• Boyi Li, Felix Wu, Kilian Q. Weinberger, Serge Belongie. Positional Normalization. NeurIPS, 2019. https://arxiv.org/abs/1907.04312