2023-07-17 10:40:04 +00:00
---
2024-06-02 19:39:34 +00:00
description: Explore detailed descriptions and implementations of various loss functions used in Ultralytics models, including Varifocal Loss, Focal Loss, Bbox Loss, and more.
keywords: Ultralytics, loss functions, Varifocal Loss, Focal Loss, Bbox Loss, Rotated Bbox Loss, Keypoint Loss, YOLO, model training, documentation
2023-07-17 10:40:04 +00:00
---
2023-08-03 16:44:40 +00:00
# Reference for `ultralytics/utils/loss.py`
2025-11-23 18:53:50 +00:00
!!! success "Improvements"
2023-08-03 16:44:40 +00:00
2025-11-23 18:53:50 +00:00
This page is sourced from [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/loss.py ](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/loss.py ). Have an improvement or example to add? Open a [Pull Request ](https://docs.ultralytics.com/help/contributing/ ) — thank you! 🙏
2023-08-03 16:44:40 +00:00
2024-07-21 18:14:49 +00:00
< br >
2023-11-25 16:59:01 +00:00
2023-08-03 16:44:40 +00:00
## ::: ultralytics.utils.loss.VarifocalLoss
2023-11-25 16:59:01 +00:00
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2023-07-16 15:47:45 +00:00
2023-08-03 16:44:40 +00:00
## ::: ultralytics.utils.loss.FocalLoss
2023-11-25 16:59:01 +00:00
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2023-07-16 15:47:45 +00:00
2024-06-29 15:50:28 +00:00
## ::: ultralytics.utils.loss.DFLoss
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2024-06-29 15:50:28 +00:00
2023-08-03 16:44:40 +00:00
## ::: ultralytics.utils.loss.BboxLoss
2023-11-25 16:59:01 +00:00
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2023-07-16 15:47:45 +00:00
2024-01-05 02:00:26 +00:00
## ::: ultralytics.utils.loss.RotatedBboxLoss
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2024-01-05 02:00:26 +00:00
2023-08-03 16:44:40 +00:00
## ::: ultralytics.utils.loss.KeypointLoss
2023-11-25 16:59:01 +00:00
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2023-07-16 15:47:45 +00:00
2023-08-03 16:44:40 +00:00
## ::: ultralytics.utils.loss.v8DetectionLoss
2023-11-25 16:59:01 +00:00
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2023-07-16 15:47:45 +00:00
2023-08-03 16:44:40 +00:00
## ::: ultralytics.utils.loss.v8SegmentationLoss
2023-11-25 16:59:01 +00:00
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2023-07-16 15:47:45 +00:00
2023-08-03 16:44:40 +00:00
## ::: ultralytics.utils.loss.v8PoseLoss
2023-11-25 16:59:01 +00:00
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2023-07-16 15:47:45 +00:00
2023-08-03 16:44:40 +00:00
## ::: ultralytics.utils.loss.v8ClassificationLoss
2023-11-25 16:59:01 +00:00
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2024-01-05 02:00:26 +00:00
## ::: ultralytics.utils.loss.v8OBBLoss
2024-07-21 18:14:49 +00:00
< br > < br > < hr > < br >
2024-06-20 18:31:48 +00:00
## ::: ultralytics.utils.loss.E2EDetectLoss
2025-03-31 08:50:01 +00:00
< br > < br > < hr > < br >
## ::: ultralytics.utils.loss.TVPDetectLoss
< br > < br > < hr > < br >
## ::: ultralytics.utils.loss.TVPSegmentLoss
2024-06-20 18:31:48 +00:00
< br > < br >