---
title: nn.backends.onnx API Reference
description: Explore ONNXBackend and ONNXIMXBackend for Microsoft ONNX Runtime inference, supporting standard ONNX models and NXP IMX-optimized variants.
keywords: Ultralytics, ONNXBackend, ONNXIMXBackend, Microsoft ONNX Runtime, Sony IMX, ONNX inference, edge deployment, deep learning
---

# Reference for `ultralytics/nn/backends/onnx.py`

!!! success "Improvements"

    This page is sourced from [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/nn/backends/onnx.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/nn/backends/onnx.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.nn.backends.onnx.ONNXBackend

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## ::: ultralytics.nn.backends.onnx.ONNXIMXBackend

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