[](https://github.com/ultralytics/ultralytics/actions/workflows/ci.yaml)
## Install
```bash
pip install ultralytics
```
Development
```
git clone https://github.com/ultralytics/ultralytics
cd ultralytics
pip install -e .
```
## Usage
### 1. CLI
To simply use the latest Ultralytics YOLO models
```bash
yolo task=detect mode=train model=yolov8n.yaml args=...
classify predict yolov8n-cls.yaml args=...
segment val yolov8n-seg.yaml args=...
export yolov8n.pt format=onnx
```
### 2. Python SDK
To use pythonic interface of Ultralytics YOLO model
```python
from ultralytics import YOLO
model = YOLO("yolov8n.yaml") # create a new model from scratch
model = YOLO(
"yolov8n.pt"
) # load a pretrained model (recommended for best training results)
results = model.train(data="coco128.yaml", epochs=100, imgsz=640)
results = model.val()
results = model.predict(source="bus.jpg")
success = model.export(format="onnx")
```
## Models
| Model | size
(pixels) | mAPval
50-95 | Speed
CPU
(ms) | Speed
T4 GPU
(ms) | params
(M) | FLOPs
(B) |
| ------------------------------------------------------------------------------------------------ | --------------------- | -------------------- | ------------------------- | ---------------------------- | ------------------ | ----------------- |
| [YOLOv5n](https://github.com/ultralytics/yolov5/releases/download/v6.2/yolov5n.pt) | 640 | 28.0 | - | - | **1.9** | **4.5** |
| [YOLOv6n](url) | 640 | 35.9 | - | - | 4.3 | 11.1 |
| **[YOLOv8n](url)** | 640 | **37.3** | - | - | 3.2 | 8.9 |
| | | | | | | |
| [YOLOv5s](https://github.com/ultralytics/yolov5/releases/download/v6.2/yolov5s.pt) | 640 | 37.4 | - | - | 7.2 | 16.5 |
| [YOLOv6s](url) | 640 | 43.5 | - | - | 17.2 | 44.2 |
| **[YOLOv8s](url)** | 640 | **44.9** | - | - | 11.2 | 28.8 |
| | | | | | | |
| [YOLOv5m](https://github.com/ultralytics/yolov5/releases/download/v6.2/yolov5m.pt) | 640 | 45.4 | - | - | 21.2 | 49.0 |
| [YOLOv6m](url) | 640 | 49.5 | - | - | 34.3 | 82.2 |
| **[YOLOv8m](url)** | 640 | **50.2** | - | - | 25.9 | 79.3 |
| | | | | | | |
| [YOLOv5l](https://github.com/ultralytics/yolov5/releases/download/v6.2/yolov5l.pt) | 640 | 49.0 | - | - | 46.5 | 109.1 |
| [YOLOv6l](url) | 640 | 52.5 | - | - | 58.5 | 144.0 |
| [YOLOv7](url) | 640 | 51.2 | - | - | 36.9 | 104.7 |
| **[YOLOv8l](url)** | 640 | **52.9** | - | - | 43.7 | 165.7 |
| | | | | | | |
| [YOLOv5x](https://github.com/ultralytics/yolov5/releases/download/v6.2/yolov5x.pt) | 640 | 50.7 | - | - | 86.7 | 205.7 |
| [YOLOv7-X](url) | 640 | 52.9 | - | - | 71.3 | 189.9 |
| **[YOLOv8x](url)** | 640 | **53.9** | - | - | 68.2 | 258.5 |
| | | | | | | |
| [YOLOv5x6](https://github.com/ultralytics/yolov5/releases/download/v6.2/yolov5x6.pt) | 1280 | 55.0 | - | - | 140.7 | 839.2 |
| [YOLOv7-E6E](url) | 1280 | 56.8 | - | - | 151.7 | 843.2 |
| **[YOLOv8x6](https://github.com/ultralytics/yolov5/releases/download/v6.2/yolov5x6.pt)**
+TTA | 1280 | -
- | -
- | -
- | 97.4 | 1047.2
- |
If you're looking to modify YOLO for R&D or to build on top of it, refer to [Using Trainer](<>) Guide on our docs.