anchor.diff:  
   :test_whl_pacakage_error
   echo 1 > %cache_dir%\error_code.txt
  +type %cache_dir%\error_code.txt
   echo Test import paddle failed, will exit!
   exit /b 1
   
  
positive.code: 
  :check_change_of_unittest_error
  echo 1 > %cache_dir%\error_code.txt
  exit /b 1
  
  
  :timestamp
  echo on
  setlocal enabledelayedexpansion
  set start=%~1
  set dd=%start:~2,2%
  
negative.code: 
  :build_error
  echo 7 > %cache_dir%\error_code.txt
  type %cache_dir%\error_code.txt
  echo Build Paddle failed, will exit!
  exit /b 7
  
  