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64ad5871ae
## Motivation This fixes #2493. When the `label_map` is created, the index for ignored classes was being set to -1, whereas the index that is actually ignored is 255. This worked indirectly since -1 was underflowed to 255 when converting to uint8. The same fix was made in the 1.x by #2332 but this fix was never made to `master`. ## Modification The only small modification is setting the index of ignored classes to 255 instead of -1. ## Checklist - [x] Pre-commit or other linting tools are used to fix the potential lint issues. - _I've fixed all linting/pre-commit errors._ - [x] The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness. - _No unit tests need to be added. Unit tests that are affected were modified. - [x] If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMDet3D. - _I don't think this change affects MMDet or MMDet3D._ - [x] The documentation has been modified accordingly, like docstring or example tutorials. - _This change fixes an existing bug and doesn't require modifying any documentation/docstring._