---
title: utils.nms API Reference
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`

!!! success "Improvements"

    This page is sourced from [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/nms.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/utils/nms.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.utils.nms.TorchNMS

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## ::: ultralytics.utils.nms.non_max_suppression

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