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description: Explore Ultralytics' versatile loss functions - VarifocalLoss, BboxLoss, v8DetectionLoss, v8PoseLoss. Improve your accuracy on YOLO implementations. |
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keywords: Ultralytics, Loss functions, VarifocalLoss, BboxLoss, v8DetectionLoss, v8PoseLoss, YOLO, Ultralytics 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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## ::: ultralytics.utils.loss.VarifocalLoss |
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<br><br> |
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## ::: ultralytics.utils.loss.FocalLoss |
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<br><br> |
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## ::: ultralytics.utils.loss.BboxLoss |
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<br><br> |
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## ::: ultralytics.utils.loss.KeypointLoss |
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<br><br> |
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## ::: ultralytics.utils.loss.v8DetectionLoss |
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<br><br> |
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## ::: ultralytics.utils.loss.v8SegmentationLoss |
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<br><br> |
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## ::: ultralytics.utils.loss.v8PoseLoss |
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<br><br> |
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## ::: ultralytics.utils.loss.v8ClassificationLoss |
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<br><br>
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