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---
description: Explore the utility functions for matching in trackers used by Ultralytics, including linear assignment, IoU distance, embedding distance, and more.
keywords: Ultralytics, matching utils, linear assignment, IoU distance, embedding distance, fuse score, tracking, Python, documentation
---
# Reference for `ultralytics/trackers/utils/matching.py`
!!! note
This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/trackers/utils/matching.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/trackers/utils/matching.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/trackers/utils/matching.py) 🛠. Thank you 🙏!
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## ::: ultralytics.trackers.utils.matching.linear_assignment
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## ::: ultralytics.trackers.utils.matching.iou_distance
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## ::: ultralytics.trackers.utils.matching.embedding_distance
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## ::: ultralytics.trackers.utils.matching.fuse_score
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