[Fix] Fix repo based on refactoring standard (#1869)

mmseg/__init__.py

mmseg/datasets/__init__.py

mmseg/datasets/ade.py

mmseg/datasets/basesegdataset.py

mmseg/datasets/chase_db1.py

mmseg/datasets/cityscapes.py

mmseg/datasets/coco_stuff.py

mmseg/datasets/drive.py

mmseg/datasets/hrf.py

mmseg/datasets/isaid.py

mmseg/datasets/isprs.py

mmseg/datasets/loveda.py

mmseg/datasets/pascal_context.py

mmseg/datasets/potsdam.py

mmseg/datasets/stare.py

mmseg/datasets/transforms/compose.py

mmseg/datasets/transforms/formatting.py

mmseg/datasets/voc.py

mmseg/models/backbones/bisenetv1.py

mmseg/models/backbones/bisenetv2.py