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---
description: Explore in-depth guidance for using Ultralytics trackers utils matching, including merge_matches, linear_assignment, iou_distance, embedding_distance, fuse_motion, and fuse_score.
keywords: Ultralytics, Trackers Utils, Matching, merge_matches, linear_assignment, iou_distance, embedding_distance, fuse_motion, fuse_score, 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](/help/contributing.md) 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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