Added warning message when --single-cls
is used incorrectly by [#13028](https://github.com/ultralytics/yolov5/issues/13028)
#12911
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6m 28s | |
3m 28s | |
9m 29s | |
6m 28s | |
2m 32s | |
2s | |
28m 27s |