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SegFormer: Simple and Efficient Design for Semantic Segmentation with Transformers
Enze Xie · Wenhai Wang · Zhiding Yu · Anima Anandkumar · Jose M. Alvarez · Ping Luo

Tue Dec 07 08:30 AM -- 10:00 AM (PST) @ None #None

We present SegFormer, a simple, efficient yet powerful semantic segmentation framework which unifies Transformers with lightweight multilayer perceptron (MLP) decoders. SegFormer has two appealing features: 1) SegFormer comprises a novel hierarchically structured Transformer encoder which outputs multiscale features. It does not need positional encoding, thereby avoiding the interpolation of positional codes which leads to decreased performance when the testing resolution differs from training. 2) SegFormer avoids complex decoders. The proposed MLP decoder aggregates information from different layers, and thus combining both local attention and global attention to render powerful representations. We show that this simple and lightweight design is the key to efficient segmentation on Transformers. We scale our approach up to obtain a series of models from SegFormer-B0 to Segformer-B5, which reaches much better performance and efficiency than previous counterparts.For example, SegFormer-B4 achieves 50.3% mIoU on ADE20K with 64M parameters, being 5x smaller and 2.2% better than the previous best method. Our best model, SegFormer-B5, achieves 84.0% mIoU on Cityscapes validation set and shows excellent zero-shot robustness on Cityscapes-C.

Author Information

Enze Xie (The University of Hong Kong)

I am a PhD student in Department of Computer Science, The University of Hong Kong (HKU) since 2019, supervised by Prof. Ping Luo and co-supervised by Prof. Wenping Wang. I obtained B.S. from Nanjing University of Aeronautics and Astronautics (2016) and M.S. from TongJi University (2019). From 2018 to present, I collaborated with several researchers in industry e.g. Face++(Megvii), SenseTime, Facebook, Huawei and NVIDIA. My research interest is computer vision in 2D and 3D. I did some works about instance-level detection and self/semi/weak-supervised learning. I developed a few well-known computer vision algorithms including PolarMask, which was selected as CVPR 2020 Top-10 Influential Papers. I co-developed OpenSelfSup(1k+ star), a popular self-supervised learning framework. I am finding a full-time research job. Please contact me!

Wenhai Wang (Nanjing University)
Zhiding Yu (Carnegie Mellon University)
Anima Anandkumar (NVIDIA / Caltech)
Jose M. Alvarez (NVIDIA)
Ping Luo (The University of Hong Kong)

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