Ultralytics Files

🌟 Summary

Ultralytics 8.4.197 makes AMP checks work without downloading model weights and removes PyYAML from the base dependencies. 🚀

📊 Key Changes

• AMP checks no longer download a checkpoint. The check builds an untrained YOLO26n from its YAML config and compares FP32 and AMP results across convolution and attention layers.
• AMP checks are more independent of training setup. They check the model’s device without relying on pretrained weights, internet access, or resetting callbacks.
• Ultralytics now includes its own minimal YAML reader and writer. It supports the YAML structures commonly used in Ultralytics configs, datasets, and export metadata. PyYAML is no longer a required base dependency.
• Documentation examples now use ultralytics.utils.YAML to save YAML files.

🎯 Purpose & Impact

• 📴 Smoother offline training: AMP checks can run without downloading weights, avoiding unexpected network requests and skipped checks.
• 🛡️ More reliable AMP validation: Comparing individual layers helps identify precision issues before AMP is used for training.
• 📦 Simpler installation: Removing PyYAML from the base requirements reduces a dependency for standard installs. The built-in parser covers Ultralytics’ common YAML needs, but it is not intended to support every YAML feature.
• 📄 More consistent YAML handling: Users can use the same built-in utility to load and save supported Ultralytics YAML files.

What's Changed

• Replace PyYAML with a minimal built-in YAML parser by @glenn-jocher in https://github.com/ultralytics/ultralytics/pull/26983
• ultralytics 8.4.197 Check AMP on an untrained YOLO26n without downloading weights by @glenn-jocher in https://github.com/ultralytics/ultralytics/pull/26967

Full Changelog: https://github.com/ultralytics/ultralytics/compare/v8.4.196...v8.4.197