[Fix] Fix the issue #1711 "GaussianBlur doesn't work"

[liyunlong10]

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Motivation

Please describe the motivation of this PR and the goal you want to achieve through this PR.

Fix the issue #1711 .

Modification

Please briefly describe what modification is made in this PR.

Image.filter() is not an in-place operation, its output must be assigned to a variable. In the original code, the output (blurred image) is not assigned to any variable.

This PR fix the bug, the output is now assigned to the proper variable.

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.

Use cases (Optional)

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

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.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Patch coverage: 57.48% and project coverage change: -19.71% ⚠️

Comparison is base (89eaa92) 85.22% compared to head (ebe5ba7) 65.52%.

❗ Current head ebe5ba7 differs from pull request most recent head a330a12. Consider uploading reports for the commit a330a12 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1722       +/-   ##
===========================================
- Coverage   85.22%   65.52%   -19.71%     
===========================================
  Files         229      330      +101     
  Lines       17243    25669     +8426     
  Branches     2707     4088     +1381     
===========================================
+ Hits        14696    16820     +2124     
- Misses       2046     8233     +6187     
- Partials      501      616      +115     

Flag	Coverage Δ
unittests	65.52% <57.48%> (-19.71%)	⬇️

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

Files Changed	Coverage Δ
mmpretrain/apis/image_retrieval.py	21.42% <19.04%> (+0.88%)	⬆️
mmpretrain/apis/image_caption.py	30.64% <30.64%> (ø)
mmpretrain/apis/feature_extractor.py	37.50% <40.00%> (+0.18%)	⬆️
mmpretrain/apis/model.py	75.65% <65.90%> (-4.02%)	⬇️
mmpretrain/apis/base.py	72.44% <72.44%> (ø)
mmpretrain/__init__.py	100.00% <100.00%> (ø)
mmpretrain/apis/__init__.py	100.00% <100.00%> (ø)
mmpretrain/apis/image_classification.py	86.48% <100.00%> (+0.93%)	⬆️

... and 148 files with indirect coverage changes

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[OpenMMLab-Assistant-004]

Hi @liyunlong10,

We'd like to express our appreciation for your valuable contributions to the mmpretrain. Your efforts have significantly aided in enhancing the project's quality.
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