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mmsegmentation/docs/en/notes/faq.md

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Frequently Asked Questions (FAQ)

We list some common troubles faced by many users and their corresponding solutions here. Feel free to enrich the list if you find any frequent issues and have ways to help others to solve them. If the contents here do not cover your issue, please create an issue using the provided templates and make sure you fill in all required information in the template.

Installation

The compatible MMSegmentation, MMCV and MMEngine versions are as below. Please install the correct versions of them to avoid installation issues.

MMSegmentation version MMCV version MMEngine version MMClassification (optional) version MMDetection (optional) version
dev-1.x branch mmcv >= 2.0.0rc4 MMEngine >= 0.2.0 mmcls>=1.0.0rc0 mmdet>3.0.0rc5
1.x branch mmcv >= 2.0.0rc4 MMEngine >= 0.2.0 mmcls>=1.0.0rc0 mmdet>3.0.0rc5
1.0.0rc5 mmcv >= 2.0.0rc4 MMEngine >= 0.2.0 mmcls>=1.0.0rc0 mmdet>3.0.0rc5
1.0.0rc4 mmcv == 2.0.0rc3 MMEngine >= 0.1.0 mmcls>=1.0.0rc0 mmdet>=3.0.0rc4, <=3.0.0rc5
1.0.0rc3 mmcv == 2.0.0rc3 MMEngine >= 0.1.0 mmcls>=1.0.0rc0 mmdet>=3.0.0rc4 <=3.0.0rc5
1.0.0rc2 mmcv == 2.0.0rc3 MMEngine >= 0.1.0 mmcls>=1.0.0rc0 mmdet>=3.0.0rc4 <=3.0.0rc5
1.0.0rc1 mmcv >= 2.0.0rc1, <=2.0.0rc3> MMEngine >= 0.1.0 mmcls>=1.0.0rc0 Not required
1.0.0rc0 mmcv >= 2.0.0rc1, <=2.0.0rc3> MMEngine >= 0.1.0 mmcls>=1.0.0rc0 Not required

Notes: To install MMSegmentation 0.x and master branch, please refer to the faq 0.x document to check compatible versions of MMCV.

How to know the number of GPUs needed to train the model

  • Infer from the name of the config file of the model. You can refer to the Config Name Style part of Learn about Configs. For example, for config file with name segformer_mit-b0_8xb1-160k_cityscapes-1024x1024.py, 8xb1 means training the model corresponding to it needs 8 GPUs, and the batch size of each GPU is 1.
  • Infer from the log file. Open the log file of the model and search nGPU in the file. The number of figures following nGPU is the number of GPUs needed to train the model. For instance, searching for nGPU in the log file yields the record nGPU 0,1,2,3,4,5,6,7, which indicates that eight GPUs are needed to train the model.