Better dataset error handling

[ambitious-octopus]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved error handling for datasets in Ultralytics.

📊 Key Changes

• Added a new DatasetError class for dataset-related issues.
• Updated get_dataset error handling to use DatasetError.

🎯 Purpose & Impact

• Clearer Error Messages: Provides more informative messages when dataset errors occur, helping users troubleshoot effectively.
• Enhanced User Guidance: Directs users to documentation for assistance, improving the user experience.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 40.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 72.86%. Comparing base (72da276) to head (6e84691).

Files with missing lines	Patch %	Lines
ultralytics/data/utils.py	16.66%	5 Missing :warning:
ultralytics/data/base.py	40.00%	3 Missing :warning:
ultralytics/utils/errors.py	60.00%	2 Missing :warning:
ultralytics/data/dataset.py	50.00%	1 Missing :warning:
ultralytics/engine/trainer.py	50.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16634      +/-   ##
==========================================
- Coverage   72.89%   72.86%   -0.03%     
==========================================
  Files         133      133              
  Lines       17733    17742       +9     
==========================================
+ Hits        12926    12928       +2     
- Misses       4807     4814       +7     

Flag	Coverage Δ
Benchmarks	33.78% <40.00%> (-0.02%)	:arrow_down:
GPU	37.51% <40.00%> (+0.02%)	:arrow_up:
Tests	66.75% <40.00%> (+0.01%)	:arrow_up:

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[glenn-jocher]

@ambitious-octopus I don't think we need an entire class to deliver a help message. We have existing examples of this, no reason to reinvent the wheel:

https://github.com/ultralytics/ultralytics/blob/7d6528a41ac181daee2ef33fcdde5be0d57b0be7/ultralytics/utils/init.py#L1193-L1203

[github-actions[bot]]

👋 Hello there! We wanted to let you know that we've decided to close this pull request due to inactivity. We appreciate the effort you put into contributing to our project, but unfortunately, not all contributions are suitable or aligned with our product roadmap.

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