ultralytics/docs/en/reference/utils/nms.md

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---
description: Custom NMS implementation for Ultralytics YOLO with TorchNMS class for torchvision-free inference and fast-nms for oriented bounding boxes. Optimized for speed and accuracy.
keywords: NMS, non-maximum suppression, TorchNMS, YOLO, torchvision-free, rotated NMS, object detection, bounding boxes, IoU threshold, custom implementation
---
# Reference for `ultralytics/utils/nms.py`
!!! note
This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/nms.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/nms.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/utils/nms.py) 🛠️. Thank you 🙏!
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## ::: ultralytics.utils.nms.TorchNMS
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## ::: ultralytics.utils.nms.non_max_suppression
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