* add support to gcc8, add docker env test=develop

* add dgc.tgz to bos

* test=develop, Support for online compilation of openblas

* test=develop, Modify the prefix of openblas static library

* Support looking up embeddings from BoxPS.
* Add a _pull_box_sparse op, for now this op is not exposed to users.
* Add a BoxHelper class, providing 'BeginPass', 'EndPass', 'FeedPass' functions and so on.
* Add 'BoxPSDataset' in python code.
* Add a compile options WITH_BOX_PS and a MACRO PADDLE_WITH_BOX_PS.
* Add UT.
* More concrete information pls refer to: https://github.com/PaddlePaddle/Paddle/pull/18982

* Implement the operator with sprase matrix multiply

* Update the URL of mklml library.

test=develop

* Disable MKLML implematation when using no-linux.

test=develop

* Ignore the deprecated status for windows

test=develop

* fix compilation issue in windows vs2017, test=develop

* fix gtest lib not found issue, test=develop

test=develop

* upgrade ngraph to v0.24 test=develop

* simplify io test=develop

test=develop

test=develop

* test=develop, fix docker with paddle nccl problem

* test=develop, downgrade gcc to 4.8 for latest-dev

* test=develop, downgrade gcc to 4.8 for latest-dev

* test=develop, modify cmake to renew all third_party

* test=develop, invoke ci

* test=develop, invoke ci

* test=develop, complie python with wide-unicode

* test=deveop, refine env settings

* test=deveop, refine env settings

* remove the obsolete cmake options, test=develop

* remove unittests, test=develop

change url of pslib.tar.gz

* add support for cuda9 on windows test=develop
* use different git address for cuda9 compatible on windows 

The cdn.bcebos.com can be unstable randomly for unknown reason, restore it to bj.bcebos.com.

* fix the dll not found issue on windows

* fix the random compilation failure on windows 

* add save/load model, shrink table, cvm, config file & fix pull dense bug
test=develop

* fix global shuffle bug, fix pull dense bug, fix release memeory bug, fix shrink error
add client flush, add get data size
test=develop

* fix global shuffle bug
test=develop

* fix global shuffle bug
test=develop

* fix code style
test=develop

* fix code style & modify pslib cmake
test=develop

* fix error of _role_maker
test=develop

* fix code style
test=develop

* fix code style
test=develop

* fix code style
test=develop

* fix code style
test=develop

* fix code style
test=develop

* fix windows compile error of fleet
test=develop

* fix global shuffle bug

* add comment
test=develop

* update pslib.cmake
test=develop

* fix fill sparse bug
test=develop

* fix push sparse bug
test=develop

* remove unused FLAGS_warpctc_dir

test=develop

* remove FLAGS_warpctc_dir

test=develop

test=develop
This reverts commit c38c7c56.

* link the libwbaes.so into paddle

* polish detail, test=develop

* try fix mac_pr_ci error, test=develop

* add compile option, test=develop

* fix ci error, test=develop

* ignore failed to find mac lib, test=develop

* change cdn to bj, cdn can't get the latest version

* trigger ci, test=develop

* temporary delete win32 lib linking, test=develop

* change https to http, test=develop

* turn compile option on to off

* turn compile option off to on, test=develop

* try lib compiled by gcc4.8, test=develop

* update lib version, test=develop

* link other lib, test=develop

* add setup config

* delete false, test=develop

* delete no_soname, test=develop

* recover so name set

* fix, test=develop

* adjust make config, test=develop

* remove link to wbaes, test=develop

* remove useless define, test=develop

* fix compiled
test=develop

* follow comments test=develop

* fix cdn issue, test=develop

* fix cdn issue, test=develop

* Upgrade MKLDNN to v0.18-rc and fix issue caused by lib/lib64

Upgrade MKLDNN to v0.18-rc
Also fix the issue during upgrade

test=develop

* Rebase MKLDNN to rls-v0.18 branch

Some issues in v0.18-rc which caused INT8 conv op unit test failure was fixed
in rls-v0.18 branch

test=develop

* Upgrade MKLDNN from v0.18rc to formal v0.18 tag

test=develop

* Fix the windows compile issue.

test=develop

test=develop