[API Compatibility] add param decorator for paddle.amp.GradScaler -part

[Manfredss]

PR Category

User Experience

PR Types

New features

Description

add param decorator for paddle.amp.GradScaler -part
add alias for paddle.amp.GradScaler to support paddle.cuda.amp.GradScaler

是否引起精度变化

否

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@             Coverage Diff             @@
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  Coverage           ?   100.00%           
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  Files              ?         2           
  Lines              ?         4           
  Branches           ?         0           
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  Hits               ?         4           
  Misses             ?         0           
  Partials           ?         0           

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