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The OpenMMLab team released a new generation of training engineMMEngine at the World Artificial Intelligence Conference on September 1, 2022. It is a foundational library for training deep learning models. Compared with MMCV, it provides a universal and powerful runner, an open architecture with a more unified interface, and a more customizable training process.

At the same time, MMCV released2.x release candidate version and will release 2.x official version on January 1, 2023.

In version 2.x, it removed components related to the training process and added a data transformation module. Also, starting from 2.x, it renamed the package namesmmcv tommcv-lite andmmcv-full tommcv. For details, seeCompatibility Documentation.

MMCV will maintain both1.x and2.x versions. For details, seeBranch Maintenance Plan.

MMCV is a foundational library for computer vision research and it provides the following functionalities:

• Universal IO APIs
• Image/Video processing
• Image and annotation visualization
• Useful utilities (progress bar, timer, ...)
• PyTorch runner with hooking mechanism
• Various CNN architectures
• High-quality implementation of common CPU and CUDA ops

It supports the following systems:

• Linux
• Windows
• macOS

See thedocumentation for more features and usage.

Note: MMCV requires Python 3.6+.

There are two versions of MMCV:

• mmcv-full: comprehensive, with full features and various CPU and CUDA ops out of the box. It takes longer time to build.
• mmcv: lite, without CPU and CUDA ops but all other features, similar to mmcv<1.0.0. It is useful when you do not need those CUDA ops.

Note: Do not install both versions in the same environment, otherwise you may encounter errors likeModuleNotFound. You need to uninstall one before installing the other.Installing the full version is highly recommended if CUDA is available.

Before installing mmcv-full, make sure that PyTorch has been successfully installed following thePyTorch official installation guide.

The command to install mmcv-full:

pip install -U openmimmim install mmcv-full

If you need to specify the version of mmcv-full, you can use the following command:

mim install mmcv-full==1.7.0

If you find that the above installation command does not use a pre-built package ending with.whl but a source package ending with.tar.gz, you may not have a pre-build package corresponding to the PyTorch or CUDA or mmcv-full version, in which case you canbuild mmcv-full from source.

For more installation methods, please refer to theInstallation documentation.

If you need to use PyTorch-related modules, make sure PyTorch has been successfully installed in your environment by referring to thePyTorch official installation guide.

pip install -U openmimmim install mmcv

MMCV currently has two branches, the master and 2.x branches, which go through the following three phases.

• MIM: MIM installs OpenMMLab packages.
• MMClassification: OpenMMLab image classification toolbox and benchmark.
• MMDetection: OpenMMLab detection toolbox and benchmark.
• MMDetection3D: OpenMMLab's next-generation platform for general 3D object detection.
• MMRotate: OpenMMLab rotated object detection toolbox and benchmark.
• MMSegmentation: OpenMMLab semantic segmentation toolbox and benchmark.
• MMOCR: OpenMMLab text detection, recognition, and understanding toolbox.
• MMPose: OpenMMLab pose estimation 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.
• MMFewShot: OpenMMLab fewshot learning toolbox and benchmark.
• MMAction2: OpenMMLab's next-generation action understanding toolbox and benchmark.
• MMTracking: OpenMMLab video perception toolbox and benchmark.
• MMFlow: OpenMMLab optical flow toolbox and benchmark.
• MMEditing: OpenMMLab image and video editing toolbox.
• MMGeneration: OpenMMLab image and video generative models toolbox.
• MMDeploy: OpenMMLab model deployment framework.

If you face installation problems or runtime issues, you may first refer to thisFrequently Asked Questions to see if there is a solution. If the problem is still not solved, feel free to open anissue.

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

@misc{mmcv,    title={{MMCV: OpenMMLab} Computer Vision Foundation},    author={MMCV Contributors},    howpublished = {\url{https://github.com/open-mmlab/mmcv}},    year={2018}}

We appreciate all contributions to improve MMCV. Please refer toCONTRIBUTING.md for the contributing guideline.

MMCV is released under the Apache 2.0 license, while some specific operations in this library are with other licenses. Please refer toLICENSES.md for the careful check, if you are using our code for commercial matters.