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is_coco doesn't work!! '/' -> os.sep!!

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Improved error messages for understanding of user error with val.py. May help https://github.com/ultralytics/yolov5/issues/7291

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# Conflicts:
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* Export and detect with TensorRT engine file

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```
export.py:310: DeprecationWarning: Use build_serialized_network instead.
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```

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@imyhxy it seems we can't apply the deprecation warning fix because then export fails, so I'm reverting my previous change here.

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Accepts all arguments now by default resolving https://github.com/ultralytics/yolov5/issues/5600

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Partially addresses invalid mAPs at higher confidence threshold issue https://github.com/ultralytics/yolov5/issues/1466.

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