[Fix] Minor refine to inference

[HAOCHENYE]

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Motivation

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Modification

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BC-breaking (Optional)

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Checklist

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2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (inference@e6516d5). Click here to learn what that means.
Patch has no changes to coverable lines.

❗ Current head 4a2f1a0 differs from pull request most recent head 9971702. Consider uploading reports for the commit 9971702 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             inference     #787   +/-   ##
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  Coverage             ?   78.62%           
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  Files                ?      130           
  Lines                ?     9538           
  Branches             ?     1877           
============================================
  Hits                 ?     7499           
  Misses               ?     1717           
  Partials             ?      322           

Flag	Coverage Δ
unittests	78.62% <0.00%> (?)

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