[Distributed] fix release grad on moe model

[SylarTiaNII]

PR Category

Distributed Strategy

PR Types

Bug fixes

Description

Pcard-90602
fix release grad on moe model

[paddle-bot]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@e3ccc1e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...rs/dygraph_optimizer/dygraph_sharding_optimizer.py	0.00%	6 Missing ⚠️
...le/distributed/fleet/utils/tensor_fusion_helper.py	0.00%	6 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #74972   +/-   ##
==========================================
  Coverage           ?    0.00%           
==========================================
  Files              ?        2           
  Lines              ?       12           
  Branches           ?        0           
==========================================
  Hits               ?        0           
  Misses             ?       12           
  Partials           ?        0           

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[From00]

LGTM