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MMRazor is a model compression toolkit for model slimming and AutoML, which includes 3 mainstream technologies:

  • Neural Architecture Search (NAS)
  • Pruning
  • Knowledge Distillation (KD)
  • Quantization (in the next release)

It is a part of the OpenMMLab project.

Major features:

  • Compatibility

    MMRazor can be easily applied to various projects in OpenMMLab, due to similar architecture design of OpenMMLab as well as the decoupling of slimming algorithms and vision tasks.

  • Flexibility

    Different algorithms, e.g., NAS, pruning and KD, can be incorporated in a plug-n-play manner to build a more powerful system.

  • Convenience

    With better modular design, developers can implement new model compression algorithms with only a few codes, or even by simply modifying config files.

Below is an overview of MMRazor’s design and implementation, please refer to tutorials for more details.


This project is released under the Apache 2.0 license.


v0.1.0 was released in 12/23/2021.

Benchmark and model zoo

Results and models are available in the model zoo.


Please refer to for installation.

Getting Started

Please refer to and for the basic usage of MMRazor. There are also tutorials:


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

    title={OpenMMLab Model Compression Toolbox and Benchmark},
    author={MMRazor Contributors},
    howpublished = {\url{}},


We appreciate all contributions to improve MMRazor.
Please refer to for the contributing guideline.


MMRazor is an open source project that is contributed by researchers and engineers from various colleges and companies. We appreciate all the contributors who implement their methods or add new features, as well as users who give valuable feedbacks.
We wish that the toolbox and benchmark could serve the growing research community by providing a flexible toolkit to reimplement existing methods and develop their own new model compression methods.

Projects in OpenMMLab

  • MMCV: OpenMMLab foundational library for computer vision.
  • MIM: MIM Installs OpenMMLab Packages.
  • MMClassification: OpenMMLab image classification toolbox and benchmark.
  • MMDetection: OpenMMLab detection toolbox and benchmark.
  • MMDetection3D: OpenMMLab next-generation platform for general 3D object detection.
  • MMSegmentation: OpenMMLab semantic segmentation toolbox and benchmark.
  • MMAction2: OpenMMLab next-generation action understanding toolbox and benchmark.
  • MMTracking: OpenMMLab video perception toolbox and benchmark.
  • MMPose: OpenMMLab pose estimation toolbox and benchmark.
  • MMEditing: OpenMMLab image and video editing toolbox.
  • MMOCR: OpenMMLab toolbox for text detection, recognition and understanding.
  • MMGeneration: OpenMMlab toolkit for generative models.
  • MMFlow OpenMMLab optical flow toolbox and benchmark.
  • MMFewShot: OpenMMLab FewShot Learning Toolbox and Benchmark.
  • MMHuman3D: OpenMMLab 3D Human Parametric Model Toolbox and Benchmark.
  • MMSelfSup: OpenMMLab self-supervised learning Toolbox and Benchmark.
  • MMRazor: OpenMMLab Model Compression Toolbox and Benchmark.


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