[Unified Checkpoint] Fix split param loading directly when using ignore_merge_optimizer

[DesmonDay]

Before submitting

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# 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

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Description

同时开启ignore_merge_optimizer和split_param模式下，直接加载保存下来的checkpoint会报错，此处进行修复。

[paddle-bot]

Thanks for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 6.50407% with 115 lines in your changes missing coverage. Please review.

Project coverage is 51.31%. Comparing base (30df8b6) to head (99fb78d).
Report is 343 commits behind head on develop.

Files with missing lines	Patch %	Lines
...r/unified_checkpoint/sharding_split_param_utils.py	5.83%	113 Missing ⚠️
...p/trainer/unified_checkpoint/unified_checkpoint.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## develop #9935 +/- ## =========================================== - Coverage 51.34% 51.31% -0.03%  =========================================== Files 745 745 Lines 118590 118678 +88 =========================================== + Hits 60886 60902 +16  - Misses 57704 57776 +72 

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[ZHUI]

LGTM