Checkpoint Compression Doc

[wtmlon]

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PR changes

Description

Checkpoint Compression 文档

[paddle-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.77%. Comparing base (325deb5) to head (3a32019).
Report is 278 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9614      +/-   ##
===========================================
- Coverage    52.80%   52.77%   -0.03%     
===========================================
  Files          705      709       +4     
  Lines       110961   111172     +211     
===========================================
+ Hits         58592    58672      +80     
- Misses       52369    52500     +131     

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[ZHUI]

注明一下主要针对adam优化器，会对动量之类压缩。