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description: Explore detailed descriptions and implementations of various loss functions used in Ultralytics models, including Varifocal Loss, Focal Loss, Bbox Loss, and more. |
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keywords: Ultralytics, loss functions, Varifocal Loss, Focal Loss, Bbox Loss, Rotated Bbox Loss, Keypoint Loss, YOLO, model training, documentation |
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# Reference for `ultralytics/utils/loss.py` |
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!!! Note |
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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 🙏! |
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<br> |
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## ::: ultralytics.utils.loss.VarifocalLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.FocalLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.DFLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.BboxLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.RotatedBboxLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.KeypointLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.v8DetectionLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.v8SegmentationLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.v8PoseLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.v8ClassificationLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.v8OBBLoss |
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<br><br><hr><br> |
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## ::: ultralytics.utils.loss.E2EDetectLoss |
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<br><br>
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