Ultralytics YOLO

🌟 Summary (single-line synopsis) Ultralytics v8.4.6 is a reliability-focused release that fixes a multi-GPU DDP training crash and improves Ultralytics HUB/Platform dataset URI handling, plus several documentation upgrades 📈🛠️ 📊 Key Changes ✅ Fixed DDP multi-GPU training crash (PR #23301 by @pfabreu) Added missing PosixPath import to the generated temporary DDP training script (ultralytics/utils/dist.py). Prevents NameError: name 'PosixPath' is not defined when model paths are passed as PosixPath objects (common on Linux) during Distributed Data Parallel training 🧩🧯 ⏱️ More robust dataset URI resolution for large Ultralytics HUB/Platform datasets (PR #23305 by @glenn-jocher) ul://... dataset URLs now allow a much longer server-side preparation time (NDJSON generation) to avoid premature timeouts 🐢📦 🧹 Developer quality: BYTETracker typing modernized (PR #23304) Switched legacy # type: comments to inline type annotations in BYTETracker (no behavior change) 🧠🔧 📚 Docs + Platform guidance improvements (PR #23294, #23298) Added new docs for Activity Feed and Trash/Restore, refreshed billing/GPU pricing, added "Try on Ultralytics Platform" callouts for YOLO11 / YOLO26 / YOLOv5 / YOLOv8, plus small typo fixes ✍️🚀 🎯 Purpose & Impact DDP training is stable again on multi-GPU setups 🎛️✅ If you upgraded to 8.4.5 and saw failures when launching DDP training (especially with models like yolo26n.pt passed as a Path/PosixPath), this release removes that blocker—less downtime, fewer confusing crashes. Fewer flaky failures when using ul://... datasets from Ultralytics HUB/Platform 🌐✅ Large datasets can take longer to prepare; the smarter timeout reduces false "timeout" errors during dataset resolution. Better usability and discoverability in docs 🧭📘 Clearer Platform workflows (Activity Feed, Trash/Restore) and more direct "try it now" paths for major YOLO models. For more context, see the v8.4.6 release tag on GitHub. What's Changed Improve Platform docs by @glenn-jocher in https://github.com/ultralytics/ultralytics/pull/23294 Fix typos in YOLO26 and YOLOE docs by @raimbekovm in https://github.com/ultralytics/ultralytics/pull/23298 Longer NDJSON generation timeout by @glenn-jocher in https://github.com/ultralytics/ultralytics/pull/23305 Modernize type comments to inline annotations in byte_tracker.py by @ahmet-f-gumustas in https://github.com/ultralytics/ultralytics/pull/23304 ultralytics 8.4.6 Add missing PosixPath import in DDP train file gen by @pfabreu in https://github.com/ultralytics/ultralytics/pull/23301 New Contributors @ahmet-f-gumustas made their first contribution in https://github.com/ultralytics/ultralytics/pull/23304 Full Changelog: https://github.com/ultralytics/ultralytics/compare/v8.4.5...v8.4.6