[Tokenizer] Fix padding_side for performance

[DrownFish19]

Before submitting

• Lint code. If there are lint issues, please format the code first.

# Install and register `pre-commit` in the project folder
pip install pre-commit && pre-commit install

# Process previous code files separately
pre-commit run --file XXXX.py

• Add test cases into tests folder. If there are codecov issues, please add tests cases first.

PR types

Performance optimization

PR changes

Others

Description

Fix padding_side for performance.

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.98%. Comparing base (47de2c6) to head (f10b788).
Report is 4 commits behind head on develop.

❌ Your project status has failed because the head coverage (46.98%) is below the target coverage (58.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #10585   +/-   ##
========================================
  Coverage    46.98%   46.98%           
========================================
  Files          799      799           
  Lines       132244   132245    +1     
========================================
+ Hits         62134    62137    +3     
+ Misses       70110    70108    -2     

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