fuse not defined.

[mad-fogs]

when export_onnx is set to be true, error will be outcome:
AttributeError: 'Model' object has no attribute 'fuse'

[github-actions]

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[glenn-jocher]

@mad-fogs thank you for the bug report! This should be fixed in df7988d. We've moved onnx export functionality from detect.py into it's own file at ./models/onnx_export.py:
https://github.com/ultralytics/yolov5/blob/master/models/onnx_export.py

Example usage of the new file:

$ export PYTHONPATH="$PWD"
$ python models/onnx_export.py --weights ./weights/yolov5s.pt --img 640 --batch 1

.fuse() functionality is not available yet, so we've commented out this part in the new file and marked it as TODO.