Enhanced Validation displays unique images

[sunmooncode]

Add a new parameter for users to choose from in the detected val script. The function of this parameter is to control the output method of images in the val result.

For more details please refer to here!

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

New feature to show detection results per class image count in Ultralytics' software.

📊 Key Changes

• A configuration option per_class_img was added to control whether detection results are shown per class image count.
• Additional internal tracking for the number of targets per image by class was implemented.
• Adjustments in how detection validation metrics are recorded and reported, including support for this new per-class image count feature.

🎯 Purpose & Impact

• Clarity in Results: This feature aims to provide more detailed insights into model performance, especially in scenarios with imbalanced datasets where some classes are more frequent than others. 📈
• Improved Debugging: By understanding model performance on a per-class basis, developers and users can more easily pinpoint areas for improvement. 👀
• User Choice: The addition is optional and controlled via a configuration setting, allowing users flexibility based on their needs. ⚙️

This update should help users better understand and optimize their models, potentially leading to more accurate and efficient object detection applications.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 70.91%. Comparing base (c8b6a8b) to head (4f3cc58).

Files	Patch %	Lines
ultralytics/models/yolo/detect/val.py	66.66%	3 Missing ⚠️
ultralytics/models/yolo/pose/val.py	66.66%	1 Missing ⚠️
ultralytics/models/yolo/segment/val.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12645      +/-   ##
==========================================
- Coverage   75.21%   70.91%   -4.30%     
==========================================
  Files         123      123              
  Lines       15563    15573      +10     
==========================================
- Hits        11705    11044     -661     
- Misses       3858     4529     +671     

Flag	Coverage Δ
Benchmarks	35.67% <60.00%> (-0.03%)	⬇️
GPU	37.44% <40.00%> (-5.68%)	⬇️
Tests	67.05% <66.66%> (-3.81%)	⬇️

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[glenn-jocher]

@sunmooncode hey great, this looks like a nice improvement. Once change is that can you please remove the argument so we use this change by default? Thanks!

[sunmooncode]

I deleted the optional parameter and used it by default.

[glenn-jocher]

That sounds great, @sunmooncode! Making the feature default simplifies the usage while providing enhanced insights consistently. Thanks for your contribution! 🚀 If anything else needs to be adjusted, feel free to let us know.