[Fix] fix sam bug

[zzc98]

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Motivation

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Modification

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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.
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[codecov]

Codecov Report

Patch coverage: 45.70% and project coverage change: -1.08 ⚠️

Comparison is base (f9dcae2) 68.16% compared to head (a34514a) 67.09%.

❗ Current head a34514a differs from pull request most recent head 221b340. Consider uploading reports for the commit 221b340 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1633      +/-   ##
==========================================
- Coverage   68.16%   67.09%   -1.08%     
==========================================
  Files         295      308      +13     
  Lines       23372    24573    +1201     
  Branches     3713     3898     +185     
==========================================
+ Hits        15932    16487     +555     
- Misses       6880     7483     +603     
- Partials      560      603      +43     

Flag	Coverage Δ
unittests	67.09% <45.70%> (-1.08%)	⬇️

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

Impacted Files	Coverage Δ
mmpretrain/apis/image_retrieval.py	21.42% <ø> (ø)
mmpretrain/datasets/__init__.py	68.42% <0.00%> (-5.87%)	⬇️
mmpretrain/datasets/gqa_dataset.py	0.00% <0.00%> (ø)
mmpretrain/datasets/nocaps.py	0.00% <0.00%> (ø)
mmpretrain/datasets/scienceqa.py	0.00% <0.00%> (ø)
mmpretrain/datasets/textvqa.py	0.00% <0.00%> (ø)
mmpretrain/models/multimodal/__init__.py	40.00% <0.00%> (-4.45%)	⬇️
...retrain/models/multimodal/chinese_clip/__init__.py	0.00% <0.00%> (ø)
mmpretrain/models/multimodal/chinese_clip/bert.py	0.00% <0.00%> (ø)
...ain/models/multimodal/chinese_clip/chinese_clip.py	0.00% <0.00%> (ø)
... and 29 more

... and 1 file with indirect coverage changes

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