[Fix] Fix a visualization bug and refine dataset browser

[Ben-Louis]

Motivation

Modification

1. fix a bug about visualizer's dataset_meta.
   When testing with multiple GPUs, there are multiple processes but only one visualizer. The visualizer.dataset_meta is manually set to None occasionally in some processes in test_loop. This may lead to AttributeError in other processes when getting items from visualizer.dataset_meta.
2. refine dataset browser
   • use file_client to read image instead of mmcv.imread
   • keep bbox_file in dataset configs. Thus the visualization results match the images model receives indeed.

BC-breaking (Optional)

Use cases (Optional)

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit tests to ensure correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• CLA has been signed and all committers have signed the CLA in this PR.

[ly015]

from __future__ import annotations may have compatibility issues on python 3.6. Please consider using a string like 'BufferManager' for type hints within the class itself.

[codecov]

Codecov Report

Base: 70.34% // Head: 70.37% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (3edf57d) compared to base (60c62fc).
Patch coverage: 69.23% of modified lines in pull request are covered.

❗ Current head 3edf57d differs from pull request most recent head 7f1e8cb. Consider uploading reports for the commit 7f1e8cb to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1668      +/-   ##
===========================================
+ Coverage    70.34%   70.37%   +0.03%     
===========================================
  Files          203      203              
  Lines        11558    11564       +6     
  Branches      2019     2021       +2     
===========================================
+ Hits          8130     8138       +8     
+ Misses        3083     3078       -5     
- Partials       345      348       +3     

Flag	Coverage Δ
unittests	70.37% <69.23%> (+0.03%)	⬆️

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

Impacted Files	Coverage Δ
mmpose/apis/webcam/utils/buffer.py	0.00% <0.00%> (ø)
mmpose/engine/hooks/visualization_hook.py	75.40% <75.00%> (-0.46%)	⬇️
mmpose/visualization/local_visualizer.py	72.39% <75.00%> (-0.74%)	⬇️
mmpose/datasets/transforms/common_transforms.py	83.19% <0.00%> (ø)
mmpose/codecs/utils/refinement.py	98.52% <0.00%> (+1.47%)	⬆️
mmpose/structures/utils.py	32.55% <0.00%> (+9.30%)	⬆️

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[Ben-Louis]

from __future__ import annotations may have compatibility issues on python 3.6. Please consider using a string like 'BufferManager' for type hints within the class itself.

Solved. The corresponding unittest is add in #1662