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| description: Explore the track.py script for Ultralytics object tracking. Learn how on_predict_start, on_predict_postprocess_end, and register_tracker functions work. |
| keywords: Ultralytics, YOLO, object tracking, track.py, on_predict_start, on_predict_postprocess_end, register_tracker |
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| # Reference for `ultralytics/trackers/track.py` |
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| !!! Note |
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| This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/trackers/track.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/trackers/track.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/track.py) 🛠️. Thank you 🙏! |
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| ## ::: ultralytics.trackers.track.on_predict_start |
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| <br><br><hr><br> |
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| ## ::: ultralytics.trackers.track.on_predict_postprocess_end |
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| <br><br><hr><br> |
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| ## ::: ultralytics.trackers.track.register_tracker |
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| <br><br> |
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