compatible with New Config in mmpretrain.apis.get_model

[youqingxiaozhua]

Motivation

In the new config setting, the type value will change from str to class. Modify the get_model function to adopt class value.

Modification

If the type value in the config is a class, use the class directly.

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

No.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

No.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.77%. Comparing base (89eaa92) to head (121ff32).
⚠️ Report is 140 commits behind head on main.

Files with missing lines	Patch %	Lines
mmpretrain/apis/model.py	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1868       +/-   ##
===========================================
- Coverage   85.22%   62.77%   -22.46%     
===========================================
  Files         229      375      +146     
  Lines       17243    27180     +9937     
  Branches     2707     4310     +1603     
===========================================
+ Hits        14696    17062     +2366     
- Misses       2046     9496     +7450     
- Partials      501      622      +121     

Flag	Coverage Δ
unittests	62.77% <60.00%> (-22.46%)	⬇️

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