---
title: trackers.utils.reid API Reference
description: Reference for the shared ReID encoder and build_encoder utility used by BoT-SORT, Deep OC-SORT, and TrackTrack.
keywords: Ultralytics, ReID, Re-identification, build_encoder, object tracking, appearance model, YOLO
---

# Reference for `ultralytics/trackers/utils/reid.py`

!!! success "Improvements"

    This page is sourced from [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/trackers/utils/reid.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/trackers/utils/reid.py). Have an improvement or example to add? Open a [Pull Request](https://docs.ultralytics.com/help/contributing) — thank you! 🙏

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## ::: ultralytics.trackers.utils.reid.ReID

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## ::: ultralytics.trackers.utils.reid.build_encoder

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## ::: ultralytics.trackers.utils.reid.smooth_feature

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