Fix EMA bug when load different strategies

[sneaxiy]

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PR types

Bug fixes

PR changes

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Description

Fix EMA bug when load different strategies.
Relate to PaddlePaddle/PaddleNLP#11177

[paddle-bot]

Thanks for your contribution!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@c4e0d1d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...addleformers/trainer/utils/zero_cost_checkpoint.py	0.00%	4 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #2963   +/-   ##
==========================================
  Coverage           ?   31.41%           
==========================================
  Files              ?      420           
  Lines              ?    68526           
  Branches           ?        0           
==========================================
  Hits               ?    21527           
  Misses             ?    46999           
  Partials           ?        0           

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[From00]

LGTM