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Add warning about Windows multi-processing error when launching training (#18547)

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Signed-off-by: Mohammed Yasin <32206511+Y-T-G@users.noreply.github.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>
Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>
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Mohammed Yasin 2025-01-06 21:16:48 +08:00 • committed by GitHub
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docs/en/modes/train.md
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@ -49,6 +49,10 @@ The following are some notable features of YOLO11's Train mode:
Train YOLO11n on the COCO8 dataset for 100 [epochs](https://www.ultralytics.com/glossary/epoch) at image size 640. The training device can be specified using the `device` argument. If no argument is passed GPU `device=0` will be used if available, otherwise `device='cpu'` will be used. See Arguments section below for a full list of training arguments.
!!! warning "Windows Multi-Processing Error"
On Windows, you may receive a `RuntimeError` when launching the training as a script. Add a `if __name__ == "__main__":` block before your training code to resolve it.
!!! example "Single-GPU and CPU Training Example"
Device is determined automatically. If a GPU is available then it will be used, otherwise training will start on CPU.