[Readme] Add flash mask

[lugimzzz]

PR types

New features

PR changes

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Description

新增flashmask使用示例脚本

[paddle-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.02%. Comparing base (0289118) to head (5e1d6cf).
Report is 4 commits behind head on develop.

❗ Current head 5e1d6cf differs from pull request most recent head 41b8346

Please upload reports for the commit 41b8346 to get more accurate results.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9219      +/-   ##
===========================================
+ Coverage    52.96%   53.02%   +0.05%     
===========================================
  Files          656      657       +1     
  Lines       106258   106311      +53     
===========================================
+ Hits         56282    56367      +85     
+ Misses       49976    49944      -32     

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[DrownFish19]

建议放到llm/readme里,能力列表里增加一列，说明flashmask支持情况

[GuoxiaWang]

是不是专门弄个 FlashMask 的页面，FlashMask 不仅仅是给 Llama 支持的，只是现在只子 Llama 上适配了。如过 Attention 那个方法是个基础函数，可以给 Transformer based 的模型调用，那就是通用的了。