ultralytics/docs/en/models/yolov6.md

---
comments: true
description: Explore Meituan YOLOv6, a state-of-the-art object detection model striking a balance between speed and accuracy. Dive into features, pre-trained models, and Python usage.
keywords: Meituan YOLOv6, object detection, Ultralytics, YOLOv6 docs, Bi-directional Concatenation, Anchor-Aided Training, pretrained models, real-time applications
---

# Meituan YOLOv6

## Overview

[Meituan](https://about.meituan.com/) YOLOv6 is a cutting-edge object detector that offers remarkable balance between speed and accuracy, making it a popular choice for real-time applications. This model introduces several notable enhancements on its architecture and training scheme, including the implementation of a Bi-directional Concatenation (BiC) module, an anchor-aided training (AAT) strategy, and an improved backbone and neck design for state-of-the-art accuracy on the COCO dataset.

![Meituan YOLOv6](https://user-images.githubusercontent.com/26833433/240750495-4da954ce-8b3b-41c4-8afd-ddb74361d3c2.png)
![Model example image](https://user-images.githubusercontent.com/26833433/240750557-3e9ec4f0-0598-49a8-83ea-f33c91eb6d68.png)
**Overview of YOLOv6.** Model architecture diagram showing the redesigned network components and training strategies that have led to significant performance improvements. (a) The neck of YOLOv6 (N and S are shown). Note for M/L, RepBlocks is replaced with CSPStackRep. (b) The structure of a BiC module. (c) A SimCSPSPPF block. ([source](https://arxiv.org/pdf/2301.05586.pdf)).

### Key Features

- **Bidirectional Concatenation (BiC) Module:** YOLOv6 introduces a BiC module in the neck of the detector, enhancing localization signals and delivering performance gains with negligible speed degradation.
- **Anchor-Aided Training (AAT) Strategy:** This model proposes AAT to enjoy the benefits of both anchor-based and anchor-free paradigms without compromising inference efficiency.
- **Enhanced Backbone and Neck Design:** By deepening YOLOv6 to include another stage in the backbone and neck, this model achieves state-of-the-art performance on the COCO dataset at high-resolution input.
- **Self-Distillation Strategy:** A new self-distillation strategy is implemented to boost the performance of smaller models of YOLOv6, enhancing the auxiliary regression branch during training and removing it at inference to avoid a marked speed decline.

## Performance Metrics

YOLOv6 provides various pre-trained models with different scales:

- YOLOv6-N: 37.5% AP on COCO val2017 at 1187 FPS with NVIDIA Tesla T4 GPU.
- YOLOv6-S: 45.0% AP at 484 FPS.
- YOLOv6-M: 50.0% AP at 226 FPS.
- YOLOv6-L: 52.8% AP at 116 FPS.
- YOLOv6-L6: State-of-the-art accuracy in real-time.

YOLOv6 also provides quantized models for different precisions and models optimized for mobile platforms.

## Usage Examples

This example provides simple YOLOv6 training and inference examples. For full documentation on these and other [modes](../modes/index.md) see the [Predict](../modes/predict.md),  [Train](../modes/train.md), [Val](../modes/val.md) and [Export](../modes/export.md) docs pages.

!!! Example

    === "Python"

        PyTorch pretrained `*.pt` models as well as configuration `*.yaml` files can be passed to the `YOLO()` class to create a model instance in python:

        ```python
        from ultralytics import YOLO

        # Build a YOLOv6n model from scratch
        model = YOLO('yolov6n.yaml')

        # Display model information (optional)
        model.info()

        # Train the model on the COCO8 example dataset for 100 epochs
        results = model.train(data='coco8.yaml', epochs=100, imgsz=640)

        # Run inference with the YOLOv6n model on the 'bus.jpg' image
        results = model('path/to/bus.jpg')
        ```

    === "CLI"

        CLI commands are available to directly run the models:

        ```bash
        # Build a YOLOv6n model from scratch and train it on the COCO8 example dataset for 100 epochs
        yolo train model=yolov6n.yaml data=coco8.yaml epochs=100 imgsz=640

        # Build a YOLOv6n model from scratch and run inference on the 'bus.jpg' image
        yolo predict model=yolov6n.yaml source=path/to/bus.jpg
        ```

## Supported Tasks and Modes

The YOLOv6 series offers a range of models, each optimized for high-performance [Object Detection](../tasks/detect.md). These models cater to varying computational needs and accuracy requirements, making them versatile for a wide array of applications.

| Model Type | Pre-trained Weights | Tasks Supported                        | Inference | Validation | Training | Export |
|------------|---------------------|----------------------------------------|-----------|------------|----------|--------|
| YOLOv6-N   | `yolov6-n.pt`       | [Object Detection](../tasks/detect.md) | ✅         | ✅          | ✅        | ✅      |
| YOLOv6-S   | `yolov6-s.pt`       | [Object Detection](../tasks/detect.md) | ✅         | ✅          | ✅        | ✅      |
| YOLOv6-M   | `yolov6-m.pt`       | [Object Detection](../tasks/detect.md) | ✅         | ✅          | ✅        | ✅      |
| YOLOv6-L   | `yolov6-l.pt`       | [Object Detection](../tasks/detect.md) | ✅         | ✅          | ✅        | ✅      |
| YOLOv6-L6  | `yolov6-l6.pt`      | [Object Detection](../tasks/detect.md) | ✅         | ✅          | ✅        | ✅      |

This table provides a detailed overview of the YOLOv6 model variants, highlighting their capabilities in object detection tasks and their compatibility with various operational modes such as [Inference](../modes/predict.md), [Validation](../modes/val.md), [Training](../modes/train.md), and [Export](../modes/export.md). This comprehensive support ensures that users can fully leverage the capabilities of YOLOv6 models in a broad range of object detection scenarios.

## Citations and Acknowledgements

We would like to acknowledge the authors for their significant contributions in the field of real-time object detection:

!!! Quote ""

    === "BibTeX"

        ```bibtex
        @misc{li2023yolov6,
              title={YOLOv6 v3.0: A Full-Scale Reloading},
              author={Chuyi Li and Lulu Li and Yifei Geng and Hongliang Jiang and Meng Cheng and Bo Zhang and Zaidan Ke and Xiaoming Xu and Xiangxiang Chu},
              year={2023},
              eprint={2301.05586},
              archivePrefix={arXiv},
              primaryClass={cs.CV}
        }
        ```

The original YOLOv6 paper can be found on [arXiv](https://arxiv.org/abs/2301.05586). The authors have made their work publicly available, and the codebase can be accessed on [GitHub](https://github.com/meituan/YOLOv6). We appreciate their efforts in advancing the field and making their work accessible to the broader community.