Add notebook for importing/exporting segmentation data

[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

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Codecov Report

Patch coverage: 100.00% and project coverage change: +0.18 🎉

Comparison is base (d309631) 78.58% compared to head (a1dd25d) 78.76%.

Additional details and impacted files

@@                Coverage Diff                 @@
##           releases/1.3.0    #1023      +/-   ##
==================================================
+ Coverage           78.58%   78.76%   +0.18%     
==================================================
  Files                 237      237              
  Lines               27074    27085      +11     
  Branches             5401     5404       +3     
==================================================
+ Hits                21275    21334      +59     
+ Misses               4534     4491      -43     
+ Partials             1265     1260       -5     

Flag	Coverage Δ
macos-11_Python-3.8	77.79% <100.00%> (+0.19%)	⬆️
ubuntu-20.04_Python-3.8	78.75% <100.00%> (+0.19%)	⬆️
windows-2019_Python-3.8	?

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Impacted Files	Coverage Δ
datumaro/plugins/data_formats/cityscapes.py	88.54% <100.00%> (ø)

... and 14 files with indirect coverage changes

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[cih9088]

The dataset directory structure for cityscapes should follow this one.

It would be better to revert changes regarding cityscapes dataset and put the cityscapes format documentation link into the notebook and tell users that you should unarchive the zip files in this way to import them into Datumaro.

[wonjuleee]

The dataset directory structure for cityscapes should follow this one.

It would be better to revert changes regarding cityscapes dataset and put the cityscapes format documentation link into the notebook and tell users that you should unarchive the zip files in this way to import them into Datumaro.

I updated the Cityscapes document instead. Thank you for letting me know this.

[cih9088]

I updated the Cityscapes document instead. Thank you for letting me know this.

Since we have agreed to change the cityscapes format directory structure, we should let users know it as it might break their workflow when they update Datumaro.
Could you add it to the CHANGELOG.md?

[wonjuleee]

I updated the Cityscapes document instead. Thank you for letting me know this.

Since we have agreed to change the cityscapes format directory structure, we should let users know it as it might break their workflow when they update Datumaro. Could you add it to the CHANGELOG.md?

I updated.