ultralytics 8.3.202

v8.3.202 - `ultralytics 8.3.202` TFLite `per-channel` INT8 quantization fix (#22133)

on Python PyPI

🌟 Summary

TFLite export gets a targeted INT8 upgrade: per-channel quantization is fixed and INT8 exports are slimmer and more reliable in ultralytics 8.3.202. 🚀

📊 Key Changes

• TFLite INT8 per-channel quantization fix by @Y-T-G, resolving Issue #21030. 🔧 See PR: TFLite per-channel INT8 quantization fix
  • Removed explicit per-tensor override so per-channel INT8 works as intended (more accurate for conv weights).
  • Disabled batchmatmul_unfold when exporting INT8 to avoid massive integer_quant file sizes and improve deployment practicality.
• Distributed Tuner robustness: if a MongoDB collection exists but is empty, tuning now seeds immediately instead of falling back to CSV. 🤝 See PR: Start distributed Tuner mutation if Mongo collection exists by @glenn-jocher
• CI stability: macOS runner pinned to macos-26 for consistent builds. 🧪 See PR: Update CI workflow to run on macOS 26 by @onuralpszr

🎯 Purpose & Impact

• Better accuracy and compatibility for TFLite INT8 models: Per-channel quantization is typically more accurate for convolution-heavy models like YOLO11. 📈
• Smaller INT8 artifacts and easier deployment: Disabling batchmatmul_unfold for INT8 prevents integer_quant files from ballooning (e.g., ~27MB vs ~3.2MB), making edge deployments lighter and faster to ship. 📦
• Smoother distributed hyperparameter tuning: Immediate start in multi-worker setups when a MongoDB collection exists, improving efficiency in large experiments. ⚙️
• More reliable CI: Fewer runner surprises, faster iteration for contributors, and steadier releases for users. ✅

Quick tip to export INT8 TFLite with the new behavior:

from ultralytics import YOLO

model = YOLO("yolo11n.pt")  # or your trained YOLO11 model
model.export(format="tflite", int8=True)  # per-channel INT8 fix applied; leaner artifacts

Enjoy improved TFLite quantization and leaner edge-ready models! ✨

What's Changed

• Start distributed Tuner mutation if Mongo collection exists by @glenn-jocher in #22120
• ci: 👷 Update CI workflow to run on macOS 26 by @onuralpszr in #22119
• ultralytics 8.3.202 TFLite per-channel INT8 quantization fix by @Y-T-G in #22133

Full Changelog: v8.3.201...v8.3.202