Enhance ClassificationValidator to cope with multilabel classification datasets with label_groups

[wonjuleee]

Summary

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

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

Patch coverage: 94.11% and project coverage change: +0.01% 🎉

Comparison is base (993c9f0) 79.99% compared to head (cd7d573) 80.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1116      +/-   ##
===========================================
+ Coverage    79.99%   80.00%   +0.01%     
===========================================
  Files          258      258              
  Lines        29300    29329      +29     
  Branches      5740     5745       +5     
===========================================
+ Hits         23438    23465      +27     
- Misses        4514     4517       +3     
+ Partials      1348     1347       -1     

Flag	Coverage Δ
macos-11_Python-3.8	79.10% <94.11%> (+0.02%)	⬆️
ubuntu-20.04_Python-3.8	?
windows-2019_Python-3.8	79.91% <94.11%> (+0.01%)	⬆️

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Files Changed	Coverage Δ
src/datumaro/plugins/data_formats/datumaro/base.py	88.03% <ø> (ø)
...datumaro/plugins/data_formats/datumaro/exporter.py	95.41% <ø> (ø)
src/datumaro/components/annotation.py	89.52% <84.61%> (-0.13%)	⬇️
src/datumaro/plugins/validators.py	94.96% <100.00%> (+0.14%)	⬆️

... and 2 files with indirect coverage changes

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[vinnamkim]

LGTM, but would you insert a new line at the end of files? You can enable this option in your VSCode to make it always on.

[wonjuleee]

LGTM, but would you insert a new line at the end of files? You can enable this option in your VSCode to make it always on.

Thank you for letting me know this. I set up settings.json and added new lines in annotation files.