Add CommonSemanticSegmentationWithSubsetDirsImporter

[vinnamkim]

Summary

• Ticket no. 104803
• To simplify OTX CLI data argument, extend Datumaro CommonSemanticSegmentation format importer to cover the following subset structure.

    Dataset/
    └─ <split: train,val, ...>
        ├── dataset_meta.json # a list of labels
        ├── images/
        │   ├── <img1>.png
        │   ├── <img2>.png
        │   └── ...
        └── masks/
            ├── <img1>.png
            ├── <img2>.png
            └── ... 
Then, the imported dataset will have train, val, ... CommonSemanticSegmentation subsets.

• CommonSemanticSegmentationWithSubsetDirsImporter will take this role.
• Refactor and migrate CommonSemanticSegmentation unit tests to pytest.

How to test

Include unit tests to cover it's implementation.

Checklist

• I submit my changes into the develop branch
• I have added description of my changes into CHANGELOG
• I have updated the documentation accordingly
• I have added tests to cover my changes
• I have linked related issues

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below)

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

[codecov-commenter]

Codecov Report

Base: 78.33% // Head: 78.35% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (60565c7) compared to base (79b9eb1).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #826      +/-   ##
===========================================
+ Coverage    78.33%   78.35%   +0.01%     
===========================================
  Files          189      189              
  Lines        23681    23697      +16     
  Branches      4895     4901       +6     
===========================================
+ Hits         18550    18567      +17     
  Misses        4032     4032              
+ Partials      1099     1098       -1     

Flag	Coverage Δ
macos-11_Python-3.8	77.65% <100.00%> (+0.01%)	⬆️
ubuntu-20.04_Python-3.8	78.33% <100.00%> (+0.01%)	⬆️
windows-2019_Python-3.8	78.26% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datumaro/util/image.py	90.39% <ø> (ø)
datumaro/components/format_detection.py	92.98% <100.00%> (+0.34%)	⬆️
...ugins/data_formats/common_semantic_segmentation.py	82.02% <100.00%> (+0.62%)	⬆️
datumaro/plugins/data_formats/imagenet.py	90.14% <100.00%> (ø)
datumaro/util/os_util.py	64.70% <100.00%> (+1.34%)	⬆️
datumaro/plugins/splitter.py	88.66% <0.00%> (+0.22%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.