v8.4.3 - `ultralytics 8.4.3` Faster Platform NDJSON downloads (#23257) - ultralytics Release Notes

## 🌟 Summary (single-line synopsis) Ultralytics `v8.4.3` boosts **Ultralytics Platform NDJSON dataset downloads/conversion speed** 🚀, improves **training metric correctness** 🧠, and refreshes defaults/docs around **YOLO26** 📚. ## 📊 Key Changes - 🚀 **Faster NDJSON → YOLO dataset conversion (Ultralytics Platform data) — PR #23257 by @glenn-jocher** - Lazy-loads `aiohttp` only when NDJSON conversion is used (faster startup, fewer unnecessary deps) 📦 - Simplifies async image download code and improves concurrency scaling to match dataset size ⚡ - Small robustness improvement for Platform URL handling 🌐 - Version bump: `8.4.2 → 8.4.3` 🔖 - 🌐 **Configurable Platform base URL — PR #23256 by @glenn-jocher** - Adds `ULTRALYTICS_PLATFORM_URL` to point callbacks/links to staging or local environments 🧪 - 🏷️ **Defaults and examples move to YOLO26 — PR #23242 by @Laughing-q** - Default `YOLO()`/CLI fallback model becomes `yolo26n.pt` and many docs/examples follow suit ✅ - ⚙️ **Training optimizer and warmup logic made more reliable — PR #23234 by @Laughing-q** - Parameter groups are explicitly labeled; warmup LR now targets the **bias** group by name (not by position) 🔥 - “Auto” optimizer strategy simplified around MuSGD with improved defaults 🎛️ - 🧍 **Pose training logs are more accurate — PR #23230 by @lmycross** - Only reports `rle_loss` when the model actually supports it (avoids confusing metrics) 🧾 - 🧩 **IMX inference/export consistency improvements — PR #23235 by @Laughing-q** - Anchor/stride refresh is more robust for changing input shapes; IMX decode path simplified 🔧 - ✅ **Fix duplicated `Results.summary()` entries — PR #23218 by @xusuyong** - Prevents duplicated rows in summaries (cleaner analytics/logging) 🧹 - 📈 **Benchmark tables clarified with end-to-end (e2e) metrics — PR #23238** - README tables now clearly distinguish e2e evaluation metrics for YOLO26 tasks 📊 - 🍓 **Raspberry Pi 5 guide updated with YOLO26 benchmarks — PR #23227** - Refreshes benchmark formats and adds ExecuTorch results 📌 ## 🎯 Purpose & Impact - 🚀 **If you use Ultralytics Platform datasets (NDJSON):** faster, cleaner dataset conversion and downloads means **quicker “time-to-train”** and fewer download bottlenecks—especially on larger datasets. - 📦 **If you don’t use NDJSON conversion:** lazy dependency loading reduces unnecessary imports and can make the package feel lighter/faster in common workflows. - 🌐 **For teams using staging/local Platform:** `ULTRALYTICS_PLATFORM_URL` makes it much easier to test integrations without patching code. - ⚙️ **For training reliability:** optimizer/warmup changes reduce edge-case misconfiguration and make training behavior **more predictable** across models/runs. - 🧾 **For pose users:** loss reporting now matches model capability, improving trust in logs/metrics during training. - 📚 **For new users:** YOLO26 becomes the “default path” in examples, reducing confusion about which model name to start with. ## What's Changed * Fix: dynamically adapt pose loss names to model type by @lmycross in https://github.com/ultralytics/ultralytics/pull/23230 * Update auto optimizer strategy and fix mismatched `warmup_lr` by @Laughing-q in https://github.com/ultralytics/ultralytics/pull/23234 * Update `IMX` inference wrapper by @Laughing-q in https://github.com/ultralytics/ultralytics/pull/23235 * Update `README.md` metrics table by @Laughing-q in https://github.com/ultralytics/ultralytics/pull/23238 * Update Raspberry Pi 5 docs with YOLO26 benchmarks by @lakshanthad in https://github.com/ultralytics/ultralytics/pull/23227 * Use `yolo26n` in docs and examples by @Laughing-q in https://github.com/ultralytics/ultralytics/pull/23242 * Remove duplicate result appending logic by @xusuyong in https://github.com/ultralytics/ultralytics/pull/23218 * Platform URL ENVs by @glenn-jocher in https://github.com/ultralytics/ultralytics/pull/23256 * `ultralytics 8.4.3` Faster Platform NDJSON downloads by @glenn-jocher in https://github.com/ultralytics/ultralytics/pull/23257 ## New Contributors * @xusuyong made their first contribution in https://github.com/ultralytics/ultralytics/pull/23218 **Full Changelog**: https://github.com/ultralytics/ultralytics/compare/v8.4.2...v8.4.3

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v8.4.3 - `ultralytics 8.4.3` Faster Platform NDJSON downloads (#23257)

🌟 Summary (single-line synopsis)

📊 Key Changes

🎯 Purpose & Impact

What's Changed

New Contributors