[Fix] Fix clip generator init bug

[fangyixiao18]

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Motivation

It has a bug while initializing the model.

Modification

Please briefly describe what modification is made in this PR.

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.

[Ezra-Yu]

LGTM.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.54 🎉

Comparison is base (c9a0cb0) 84.37% compared to head (5d99965) 84.91%.

❗ Current head 5d99965 differs from pull request most recent head 9353bb2. Consider uploading reports for the commit 9353bb2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1518      +/-   ##
==========================================
+ Coverage   84.37%   84.91%   +0.54%     
==========================================
  Files         142      230      +88     
  Lines        9925    17555    +7630     
  Branches     1621     2758    +1137     
==========================================
+ Hits         8374    14907    +6533     
- Misses       1277     2130     +853     
- Partials      274      518     +244     

Flag	Coverage Δ
unittests	84.91% <ø> (+0.54%)	⬆️

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see 372 files with indirect coverage changes

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