Fix validator and add notebooks and document for level-up validator

[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: 93.93% and project coverage change: -0.05 ⚠️

Comparison is base (e6d73a0) 78.64% compared to head (5f6088b) 78.60%.

Additional details and impacted files

@@                Coverage Diff                 @@
##           releases/1.2.0     #933      +/-   ##
==================================================
- Coverage           78.64%   78.60%   -0.05%     
==================================================
  Files                 228      231       +3     
  Lines               26349    26397      +48     
  Branches             5252     5254       +2     
==================================================
+ Hits                20723    20749      +26     
- Misses               4407     4422      +15     
- Partials             1219     1226       +7     

Flag	Coverage Δ
macos-11_Python-3.8	77.63% <93.93%> (-0.04%)	⬇️
ubuntu-20.04_Python-3.8	78.58% <93.93%> (-0.05%)	⬇️
windows-2019_Python-3.8	78.48% <93.93%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
datumaro/plugins/validators.py	90.17% <93.93%> (-0.71%)	⬇️

... and 13 files with indirect coverage changes

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[vinnamkim]

Would you tell us what you aimed to achieve by changing the code in this file? Just for refactoring?

[wonjuleee]

Yes I did, I tried to reuse some functions by refactoring.

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vinnamkim commented on 2023-04-17T02:05:32Z
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Not to be fixed in this PR, but it seems that we need to discuss about dropping UndefinedAttribute from default Validator setting. This seems completely useless for the reallife usecase.

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vinnamkim commented on 2023-04-17T02:05:33Z
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We need to make a requirement for enhancing Visualizer for this case .

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vinnamkim commented on 2023-04-17T02:05:34Z
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It would be nice if the floating histogram was also provided by the Datumaro API.

[vinnamkim]

LGTM.