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ultralytics 8.0.82 docs updates and fixes (#2098)

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Co-authored-by: Ayush Chaurasia <ayush.chaurarsia@gmail.com>
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docs/tasks/segment.md
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@ -68,6 +68,13 @@ arguments see the [Configuration](../usage/cfg.md) page.
yolo segment train data=coco128-seg.yaml model=yolov8n-seg.yaml pretrained=yolov8n-seg.pt epochs=100 imgsz=640
```
### Dataset format
YOLO segmentation dataset label format extends detection format with segment points.
`cls x1 y1 x2 y2 p1 p2 ... pn`
To convert your existing dataset from other formats( like COCO, VOC etc.) to YOLO format, please use [json2yolo tool](https://github.com/ultralytics/JSON2YOLO) by Ultralytics.
## Val
Validate trained YOLOv8n-seg model accuracy on the COCO128-seg dataset. No argument need to passed as the `model`