zjsh_yolov11/ultralytics_yolov8-main/docs/en/reference/models/utils/loss.md

description, keywords

description	keywords
Explore detailed implementations of loss functions for DETR and RT-DETR models in Ultralytics.	ultralytics, YOLO, DETR, RT-DETR, loss functions, object detection, deep learning, focal loss, varifocal loss, Hungarian matcher

Reference for ultralytics/models/utils/loss.py

!!! Note

This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/utils/loss.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/utils/loss.py). If you spot a problem please help fix it by [contributing](https://docs.ultralytics.com/help/contributing/) a [Pull Request](https://github.com/ultralytics/ultralytics/edit/main/ultralytics/models/utils/loss.py) 🛠️. Thank you 🙏!

::: ultralytics.models.utils.loss.DETRLoss

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::: ultralytics.models.utils.loss.RTDETRDetectionLoss