docs/en/reference/utils/loss.md

metadata

description: >-
  Explore Ultralytics' versatile loss functions - VarifocalLoss, BboxLoss,
  v8DetectionLoss, v8PoseLoss. Improve your accuracy on YOLO implementations.
keywords: >-
  Ultralytics, Loss functions, VarifocalLoss, BboxLoss, v8DetectionLoss,
  v8PoseLoss, YOLO, Ultralytics Documentation

Reference for ultralytics/utils/loss.py

!!! Note

This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/loss.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/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/utils/loss.py) 🛠️. Thank you 🙏!

::: ultralytics.utils.loss.VarifocalLoss

::: ultralytics.utils.loss.FocalLoss

::: ultralytics.utils.loss.BboxLoss

::: ultralytics.utils.loss.RotatedBboxLoss

::: ultralytics.utils.loss.KeypointLoss

::: ultralytics.utils.loss.v8DetectionLoss

::: ultralytics.utils.loss.v8SegmentationLoss

::: ultralytics.utils.loss.v8PoseLoss

::: ultralytics.utils.loss.v8ClassificationLoss

::: ultralytics.utils.loss.v8OBBLoss