[Fix] Fix demo and visualization

[JingweiZhang12]

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Motivation

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Modification

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BC-breaking (Optional)

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Checklist

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2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

Patch coverage: 42.68% and no project coverage change.

Comparison is base (aa10365) 46.99% compared to head (d2b71bd) 46.99%.

❗ Current head d2b71bd differs from pull request most recent head f58a690. Consider uploading reports for the commit f58a690 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-1.x    #2453   +/-   ##
========================================
  Coverage    46.99%   46.99%           
========================================
  Files          275      276    +1     
  Lines        22904    22946   +42     
  Branches      3566     3580   +14     
========================================
+ Hits         10763    10784   +21     
- Misses       11455    11479   +24     
+ Partials       686      683    -3     

Flag	Coverage Δ
unittests	46.99% <42.68%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
mmdet3d/apis/inference.py	14.45% <0.00%> (-0.18%)	⬇️
mmdet3d/datasets/transforms/loading.py	44.91% <ø> (ø)
mmdet3d/models/segmentors/cylinder3d.py	46.66% <0.00%> (ø)
mmdet3d/models/segmentors/encoder_decoder.py	22.22% <0.00%> (-0.36%)	⬇️
mmdet3d/visualization/local_visualizer.py	33.44% <0.00%> (-0.23%)	⬇️
mmdet3d/models/segmentors/base.py	60.78% <20.00%> (-0.76%)	⬇️
mmdet3d/models/segmentors/minkunet.py	39.39% <20.00%> (-1.24%)	⬇️
mmdet3d/engine/hooks/visualization_hook.py	58.02% <37.50%> (-11.84%)	⬇️
mmdet3d/models/segmentors/seg3d_tta.py	40.00% <40.00%> (ø)
mmdet3d/datasets/transforms/formating.py	58.33% <88.88%> (+3.63%)	⬆️
... and 2 more

... and 1 file with indirect coverage changes

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