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Documentation: https://mmsegmentation.readthedocs.io/

English | [简体中文](README_zh-CN.md)

## Introduction

MMSegmentation is an open source semantic segmentation toolbox based on PyTorch.
It is a part of the OpenMMLab project.

The master branch works with **PyTorch 1.5+**.

![demo image](resources/seg_demo.gif)

### Major features

- **Unified Benchmark**

  We provide a unified benchmark toolbox for various semantic segmentation methods.

- **Modular Design**

  We decompose the semantic segmentation framework into different components and one can easily construct a customized semantic segmentation framework by combining different modules.

- **Support of multiple methods out of box**

  The toolbox directly supports popular and contemporary semantic segmentation frameworks, *e.g.* PSPNet, DeepLabV3, PSANet, DeepLabV3+, etc.

- **High efficiency**

  The training speed is faster than or comparable to other codebases.

## License

This project is released under the [Apache 2.0 license](LICENSE).

## Changelog

v0.20.2 was released in 12/15/2021.
Please refer to [changelog.md](docs/en/changelog.md) for details and release history.

## Benchmark and model zoo

Results and models are available in the [model zoo](docs/en/model_zoo.md).

Supported backbones:

- [x] ResNet (CVPR'2016)
- [x] ResNeXt (CVPR'2017)
- [x] [HRNet (CVPR'2019)](configs/hrnet)
- [x] [ResNeSt (ArXiv'2020)](configs/resnest)
- [x] [MobileNetV2 (CVPR'2018)](configs/mobilenet_v2)
- [x] [MobileNetV3 (ICCV'2019)](configs/mobilenet_v3)
- [x] [Vision Transformer (ICLR'2021)](configs/vit)
- [x] [Swin Transformer (ICCV'2021)](configs/swin)
- [x] [Twins (NeurIPS'2021)](configs/twins)

Supported methods:

- [x] [FCN (CVPR'2015/TPAMI'2017)](configs/fcn)
- [x] [ERFNet (T-ITS'2017)](configs/erfnet)
- [x] [UNet (MICCAI'2016/Nat. Methods'2019)](configs/unet)
- [x] [PSPNet (CVPR'2017)](configs/pspnet)
- [x] [DeepLabV3 (ArXiv'2017)](configs/deeplabv3)
- [x] [BiSeNetV1 (ECCV'2018)](configs/bisenetv1)
- [x] [PSANet (ECCV'2018)](configs/psanet)
- [x] [DeepLabV3+ (CVPR'2018)](configs/deeplabv3plus)
- [x] [UPerNet (ECCV'2018)](configs/upernet)
- [x] [ICNet (ECCV'2018)](configs/icnet)
- [x] [NonLocal Net (CVPR'2018)](configs/nonlocal_net)
- [x] [EncNet (CVPR'2018)](configs/encnet)
- [x] [Semantic FPN (CVPR'2019)](configs/sem_fpn)
- [x] [DANet (CVPR'2019)](configs/danet)
- [x] [APCNet (CVPR'2019)](configs/apcnet)
- [x] [EMANet (ICCV'2019)](configs/emanet)
- [x] [CCNet (ICCV'2019)](configs/ccnet)
- [x] [DMNet (ICCV'2019)](configs/dmnet)
- [x] [ANN (ICCV'2019)](configs/ann)
- [x] [GCNet (ICCVW'2019/TPAMI'2020)](configs/gcnet)
- [x] [FastFCN (ArXiv'2019)](configs/fastfcn)
- [x] [Fast-SCNN (ArXiv'2019)](configs/fastscnn)
- [x] [ISANet (ArXiv'2019/IJCV'2021)](configs/isanet)
- [x] [OCRNet (ECCV'2020)](configs/ocrnet)
- [x] [DNLNet (ECCV'2020)](configs/dnlnet)
- [x] [PointRend (CVPR'2020)](configs/point_rend)
- [x] [CGNet (TIP'2020)](configs/cgnet)
- [x] [BiSeNetV2 (IJCV'2021)](configs/bisenetv2)
- [x] [STDC (CVPR'2021)](configs/stdc)
- [x] [SETR (CVPR'2021)](configs/setr)
- [x] [DPT (ArXiv'2021)](configs/dpt)
- [x] [SegFormer (NeurIPS'2021)](configs/segformer)

Supported datasets:

- [x] [Cityscapes](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#cityscapes)
- [x] [PASCAL VOC](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#pascal-voc)
- [x] [ADE20K](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#ade20k)
- [x] [Pascal Context](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#pascal-context)
- [x] [COCO-Stuff 10k](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#coco-stuff-10k)
- [x] [COCO-Stuff 164k](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#coco-stuff-164k)
- [x] [CHASE_DB1](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#chase-db1)
- [x] [DRIVE](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#drive)
- [x] [HRF](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#hrf)
- [x] [STARE](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#stare)
- [x] [Dark Zurich](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#dark-zurich)
- [x] [Nighttime Driving](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#nighttime-driving)
- [x] [LoveDA](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#loveda)
- [x] [Potsdam](https://github.com/open-mmlab/mmsegmentation/blob/master/docs/en/dataset_prepare.md#isprs-potsdam)

## Installation

Please refer to [get_started.md](docs/en/get_started.md#installation) for installation and [dataset_prepare.md](docs/en/dataset_prepare.md#prepare-datasets) for dataset preparation.

## Get Started

Please see [train.md](docs/en/train.md) and [inference.md](docs/en/inference.md) for the basic usage of MMSegmentation.
There are also tutorials for [customizing dataset](docs/en/tutorials/customize_datasets.md), [designing data pipeline](docs/en/tutorials/data_pipeline.md), [customizing modules](docs/en/tutorials/customize_models.md), and [customizing runtime](docs/en/tutorials/customize_runtime.md).
We also provide many [training tricks](docs/en/tutorials/training_tricks.md) for better training and [useful tools](docs/en/useful_tools.md) for deployment.

A Colab tutorial is also provided. You may preview the notebook [here](demo/MMSegmentation_Tutorial.ipynb) or directly [run](https://colab.research.google.com/github/open-mmlab/mmsegmentation/blob/master/demo/MMSegmentation_Tutorial.ipynb) on Colab.

## Citation

If you find this project useful in your research, please consider cite:

```latex
@misc{mmseg2020,
    title={{MMSegmentation}: OpenMMLab Semantic Segmentation Toolbox and Benchmark},
    author={MMSegmentation Contributors},
    howpublished = {\url{https://github.com/open-mmlab/mmsegmentation}},
    year={2020}
}
```

## Contributing

We appreciate all contributions to improve MMSegmentation. Please refer to [CONTRIBUTING.md](.github/CONTRIBUTING.md) for the contributing guideline.

## Acknowledgement

MMSegmentation is an open source project that welcome any contribution and feedback.
We wish that the toolbox and benchmark could serve the growing research
community by providing a flexible as well as standardized toolkit to reimplement existing methods
and develop their own new semantic segmentation methods.

## Projects in OpenMMLab

- [MMCV](https://github.com/open-mmlab/mmcv): OpenMMLab foundational library for computer vision.
- [MMClassification](https://github.com/open-mmlab/mmclassification): OpenMMLab image classification toolbox and benchmark.
- [MMDetection](https://github.com/open-mmlab/mmdetection): OpenMMLab detection toolbox and benchmark.
- [MMDetection3D](https://github.com/open-mmlab/mmdetection3d): OpenMMLab's next-generation platform for general 3D object detection.
- [MMSegmentation](https://github.com/open-mmlab/mmsegmentation): OpenMMLab semantic segmentation toolbox and benchmark.
- [MMAction2](https://github.com/open-mmlab/mmaction2): OpenMMLab's next-generation action understanding toolbox and benchmark.
- [MMTracking](https://github.com/open-mmlab/mmtracking): OpenMMLab video perception toolbox and benchmark.
- [MMPose](https://github.com/open-mmlab/mmpose): OpenMMLab pose estimation toolbox and benchmark.
- [MMEditing](https://github.com/open-mmlab/mmediting): OpenMMLab image and video editing toolbox.
- [MMOCR](https://github.com/open-mmlab/mmocr): A Comprehensive Toolbox for Text Detection, Recognition and Understanding.
- [MMGeneration](https://github.com/open-mmlab/mmgeneration): A powerful toolkit for generative models.
- [MIM](https://github.com/open-mmlab/mim): MIM Installs OpenMMLab Packages.
- [MMFlow](https://github.com/open-mmlab/mmflow): OpenMMLab optical flow toolbox and benchmark.
- [MMFewShot](https://github.com/open-mmlab/mmfewshot): OpenMMLab few shot learning toolbox and benchmark.
- [MMHuman3D](https://github.com/open-mmlab/mmhuman3d): OpenMMLab 3D human parametric model toolbox and benchmark.
- [MMSelfSup](https://github.com/open-mmlab/mmselfsup): OpenMMLab self-supervised learning toolbox and benchmark.
- [MMRazor](https://github.com/open-mmlab/mmrazor): OpenMMLab Model Compression Toolbox and Benchmark.
- [MMDeploy](https://github.com/open-mmlab/mmdeploy): OpenMMLab Model Deployment Framework.
