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description: Discover details for "HungarianMatcher" & "inverse_sigmoid" functions in Ultralytics YOLO, advanced tools supporting detection models.
keywords: Ultralytics, YOLO, HungarianMatcher, inverse_sigmoid, detection models, model utilities, ops
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# Reference for `ultralytics/models/utils/ops.py`
!!! note
Full source code for this file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/utils/ops.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/models/utils/ops.py). Help us fix any issues you see by submitting a [Pull Request](https://docs.ultralytics.com/help/contributing/) 🛠️. Thank you 🙏!
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## ::: ultralytics.models.utils.ops.HungarianMatcher
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## ::: ultralytics.models.utils.ops.get_cdn_group
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## ::: ultralytics.models.utils.ops.inverse_sigmoid
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