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description: Explore detailed implementations of loss functions for DETR and RT-DETR models in Ultralytics. |
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keywords: ultralytics, YOLO, DETR, RT-DETR, loss functions, object detection, deep learning, focal loss, varifocal loss, Hungarian matcher |
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# Reference for `ultralytics/models/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/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 🙏! |
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<br> |
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## ::: ultralytics.models.utils.loss.DETRLoss |
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<br><br><hr><br> |
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## ::: ultralytics.models.utils.loss.RTDETRDetectionLoss |
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<br><br>
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