[Cherry-pick]fix pipeline eval

[gongel]

PR types

Bug fixes

PR changes

Others

Description

• When do_train=False, do_eval=True, we need to wrap model for pipeline

[paddle-bot]

Thanks for your contribution!

[ZHUI]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 55.12%. Comparing base (30fc639) to head (932637f).
Report is 233 commits behind head on develop.

Files with missing lines	Patch %	Lines
paddlenlp/trainer/trainer.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8924      +/-   ##
===========================================
+ Coverage    55.05%   55.12%   +0.06%     
===========================================
  Files          635      635              
  Lines        99404    99406       +2     
===========================================
+ Hits         54724    54793      +69     
+ Misses       44680    44613      -67     

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