dev: Use official isort

[triple-Mu]

Link open-mmlab/mmeval#86.

[codecov]

Codecov Report

Base: 64.44% // Head: 64.38% // Decreases project coverage by -0.07% ⚠️

Coverage data is based on head (9ff81e1) compared to base (1b7d778).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #9700      +/-   ##
==========================================
- Coverage   64.44%   64.38%   -0.07%     
==========================================
  Files         370      370              
  Lines       30037    30032       -5     
  Branches     5008     5008              
==========================================
- Hits        19358    19336      -22     
- Misses       9647     9658      +11     
- Partials     1032     1038       +6     

Flag	Coverage Δ
unittests	64.38% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet/utils/setup_env.py	68.00% <0.00%> (-24.00%)	⬇️
mmdet/datasets/builder.py	45.83% <0.00%> (-7.30%)	⬇️
mmdet/core/bbox/samplers/random_sampler.py	75.00% <0.00%> (-5.56%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	87.35% <0.00%> (-2.30%)	⬇️
mmdet/utils/misc.py	62.22% <0.00%> (-2.23%)	⬇️
mmdet/core/bbox/assigners/max_iou_assigner.py	72.36% <0.00%> (-1.32%)	⬇️
mmdet/datasets/custom.py	61.45% <0.00%> (-0.20%)	⬇️
mmdet/datasets/pipelines/transforms.py	76.18% <0.00%> (-0.04%)	⬇️
mmdet/datasets/samplers/infinite_sampler.py	25.31% <0.00%> (+0.62%)	⬆️

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