RectLabel
An offline image annotation tool for object detection and segmentation.
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How to Train a YOLO26 Instance Segmentation Model with Custom Data
We will show you how to train a YOLO26 instance segmentation model with your images and annotations and export to a Core ML model which can be used for auto labeling on RectLabel.
We recommend working through this blog post side-by-side with the YOLO26 Instance Segmentation Colab notebook.
Install YOLO26.
pip install -q ultralytics
Download training images and annotations. You can use these or replace them with your own data.
mkdir datasets
cd datasets
wget -q https://huggingface.co/datasets/rectlabel/datasets/resolve/main/donut.zip
unzip -q donut.zip
cd ..
Create a workspace folder and start training from the workspace folder. Make sure the datasets path in the yaml file.
mkdir workspace
cd workspace
mv ../datasets/donut/donut.yaml .
yolo segment train data=donut.yaml model=yolo26n-seg.pt epochs=200
Move the best model to the current folder and export to a Core ML model.
mv runs/segment/train/weights/best.pt .
yolo export model=best.pt format=coreml
Now you can auto label using the Core ML model on RectLabel.