New Release: Ultralytics v8.3.250

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Ultralytics v8.3.250 is out :rocket::vertical_traffic_light:

Quick overview: v8.3.250 brings out-of-the-box support for the TT100K traffic sign dataset (auto-download + auto-convert to YOLO labels), plus smoother dataset URI handling, cleaner run directory behavior, and a handful of quality/build/docs fixes :hammer_and_wrench::books:

:vertical_traffic_light: New Features

TT100K dataset integration (221 classes)

Big thanks to @PrashantDixit0 for adding first-class TT100K support in PR #22892 :tada:

What you get:

  • New dataset config at ultralytics/cfg/datasets/TT100K.yaml with full metadata
  • Auto download + conversion pipeline that fetches TT100K and converts annotations into YOLO-format labels automatically
  • New docs page integrated into navigation via the TT100K dataset documentation :vertical_traffic_light:

Try it:

yolo detect train data=TT100K.yaml model=yolo11n.pt

:globe_with_meridians: Improvements

Dataset URI support + automatic NDJSON → YOLO conversion

PR #23146 by @glenn-jocher improves training workflows when using ul://.../datasets/... sources:

  • ul:// dataset sources are now resolved locally first
  • NDJSON datasets are automatically converted to YOLO format
  • Smarter --project handling for nested names like user/project, keeping runs organized under the expected runs directory
  • Updates to the platform webhook base URL used by the platform callback resolver

:books: Documentation Updates

Better Kaggle install + troubleshooting guidance

PR #22970 by @PrashantDixit0 adds a clearer Kaggle Installation section (internet toggle, install commands, conflict fixes) to reduce setup friction :high_voltage:

:puzzle_piece: Bug Fixes

ConfusionMatrix default type mismatch fix

PR #23138 by @raimbekovm fixes ConfusionMatrix(names=...) default from [] to {} to match the annotated type and avoid mutable-default pitfalls :white_check_mark:

:hammer_and_wrench: Build / Maintenance

ONNXRuntime C++ example build improvement

First contribution from @omar-A-hassan in PR #23137 :tada:
CMake now respects user-provided ONNXRUNTIME_ROOT, making custom install paths work as documented.

Dependency update

PR #23143 by @dependabot[bot] bumps urllib3 in the RT-DETR ONNXRuntime Python example requirements.

:up_arrow: How to update

pip install -U ultralytics

:link: Release links

You can review the full release notes in the Ultralytics v8.3.250 GitHub release and browse changes in the full changelog comparison.

:raising_hands: Feedback welcome

Give v8.3.250 a spin—especially TT100K training and ul:// dataset flows—and reply here with results, issues, or suggestions. Your feedback helps the whole YOLO community and the Ultralytics team keep improving :wrench: