【Inference】fix dynamic_forward of mtp

[freeliuzc]

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

Bug fixes

PR changes

APIs

Description

fix dynamic forward of mtp

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.18%. Comparing base (011ae71) to head (d114313).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9947      +/-   ##
===========================================
- Coverage    51.18%   51.18%   -0.01%     
===========================================
  Files          745      745              
  Lines       119016   119016              
===========================================
- Hits         60924    60922       -2     
- Misses       58092    58094       +2     

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