* add monitoring for executive ut at night

* fix some error for paddle_build.bat

* fix some error

* fix some error in windows

* fix some error on windows

* retry will not be executed when the number of failed ut is greater than 20

* add log display

* fix some error

* fix some error

* fix some error

* fix some error

* Fix xpu notest;test=kunlun

* fix

* test=kunlun

* test=kunlun

* update dockerfile

* update dockerfile

* update dockerfile

* update dockerfile

* add opencv in ci

* update cidockerfile

* test nccl

* fix diff

* fix dockerfile

* update ubuntu nccl2.7.8

* update ubuntu nccl2.7.8

* Add build paddle inference;test=document_fix

* Add build paddle inference;test=document_fix

* disable ut quickly

* fix some error

* fix some error

* install urllib2 package

* use requests package instead of urllib2

* fix error caused by windows regular parameter

* fix error on windows

* fix some error

* fix with format error

* show disable ut in log

* fix some error

* fix some error

* add the handling of error in executing get_quickly_disable_ut

* add xpu test

* notest;add kunlun_test

* notest;add kunlun_test

* notest;test=kunlun

* notest;test=kunlun

* notest;test=kunlun

* notest;test=kunlun

* test=kunlun

This reverts commit 29f1560d.

* Support python3.8

test=notest

* Fix install pr requirements.txt

* test=document_fix

* Add details to the summary and test it, test=document_fix

* Add set +e before example, test=document_fix

* Remove test code, test=document_fix

* Optimize summary information and test it, test=document_fix

* Remove test code, test=document_fix

* Restore file changes caused by pre-commit and test it, test=document_fix

* Change argument of checkout, test=document_fix

* Remove test code, test=document_fix

* add retry on mac

* fix some error

* fix with some errors

* Show more possible problems with build_and_check in file paddle_build.sh, test=develop

* Remove test codes modified in file device.py for build_and_check, test=document_fix

* Fix missing blank space in file device.py, test=document_fix

* Final process via summary_check_problems function, test=document_fix

* Add the option to execute unit tests only at night

* set ut nightly label for 3 cases.

* add unittest for paddlerolemaker with gloo

* Fix inference bug

* fix inference lib

* add fleetrun command for distributed running; test=develop

* add ci check for changing op-related api without core.ops, test=develop

* generate api_source_md5 file when build, test=develop

* add failed example, test=develop

* add failed example, test=develop

* handle exception, test=develop