[Feature] Support registry auto import modules.

[RangiLyu]

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Motivation

Support auto-import modules from pre-defined locations.
Use lazy import during building to avoid registering useless modules at the beginning.

Modification

Modify the get method.

Use case

in mmdet/registry.py

DATASETS = Registry('dataset', parent=MMENGINE_DATASETS, locations=['mmdet.datasets'])
DATA_SAMPLERS = Registry('data sampler', parent=MMENGINE_DATA_SAMPLERS, locations=['mmdet.datasets.samplers'])
TRANSFORMS = Registry('transform', parent=MMENGINE_TRANSFORMS, locations=['mmdet.datasets.transforms'])

and then the regsiter_all_modules is no longer needed

More details at open-mmlab/mmdetection#9143.

BC-Breaking

None

Verified in MMDetection, MMClassification, MMYOLO, and MMSelfsup.

[codecov]

Codecov Report

Base: 78.66% // Head: 78.83% // Increases project coverage by +0.16% 🎉

Coverage data is based on head (ddf60d1) compared to base (fe26c65).
Patch coverage: 49.48% of modified lines in pull request are covered.

❗ Current head ddf60d1 differs from pull request most recent head 45a7774. Consider uploading reports for the commit 45a7774 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #643      +/-   ##
==========================================
+ Coverage   78.66%   78.83%   +0.16%     
==========================================
  Files         128      128              
  Lines        9348     9399      +51     
  Branches     1848     1862      +14     
==========================================
+ Hits         7354     7410      +56     
+ Misses       1679     1673       -6     
- Partials      315      316       +1     

Flag	Coverage Δ
unittests	78.83% <49.48%> (+0.16%)	⬆️

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

Impacted Files	Coverage Δ
mmengine/optim/optimizer/zero_optimizer.py	52.17% <0.00%> (-4.97%)	⬇️
mmengine/registry/build_functions.py	80.20% <ø> (ø)
mmengine/registry/default_scope.py	100.00% <ø> (ø)
mmengine/runner/runner.py	84.96% <ø> (-0.19%)	⬇️
mmengine/visualization/vis_backend.py	84.49% <ø> (ø)
mmengine/visualization/visualizer.py	93.19% <ø> (ø)
mmengine/runner/checkpoint.py	52.07% <11.11%> (+8.11%)	⬆️
mmengine/model/weight_init.py	35.63% <33.33%> (+0.12%)	⬆️
mmengine/registry/registry.py	89.44% <41.93%> (-3.15%)	⬇️
mmengine/optim/optimizer/optimizer_wrapper.py	62.06% <71.42%> (-0.44%)	⬇️
... and 6 more

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[HAOCHENYE]

check_instance_created only checks the instance name rather than the scope name.

[RangiLyu]

It is exactly used to check the instance with the name of scope here.

[HAOCHENYE]

Approved!!!

[zhouzaida]

It would be better to add this usage to docs/zh_cn/tutorials/registry.md and docs/en/tutorials/registry.md