Add a dataset analysis tool that counts the percentage of pixels in each category 添加一个数据集分析工具，统计每个类别的像素占比

[OpenMMLab-Assistant-004]

Add a dataset analysis tool that counts the percentage of pixels in each category

添加一个数据集分析工具，统计每个类别的像素占比

1. add the script to the tools folder

2. The input to the script is the path to the dataset

3. 将脚本添加到 tools 文件夹下

4. 脚本的输入是数据集的路径

Task Information

Repository：MMSegmentation

Difficulty：Medium

Points：30

Estimated Time Consumption：14 days

Task Status

Claimant's Github ID：None

Claim Time：None

PR Link：None

Points to Note

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