--- 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 🙏!

## ::: ultralytics.trackers.utils.matching.linear_assignment

## ::: ultralytics.trackers.utils.matching.iou_distance

## ::: ultralytics.trackers.utils.matching.embedding_distance

## ::: ultralytics.trackers.utils.matching.fuse_score