* Enable mul operator for a ngraph
test=develop

* Enable activation ops test
test=develop

* Remove unused line
test=develop

* - Added transpose MKLDNN Op
- Few basic UT works
- Added 1D transpose
- implementing generic mem desc for MKLDNN transpose
- Modified trnaspose op to support  more dimensional data eg. 5,6..10
- Added is_test attribute to transpose op

test=develop

* - Added support for MKLDNN::memory::format::any for Transpose MKLDNN op

test=develop

* - Additional transpose mkldnn op correction to mkldnn layout

test=develop

* Cosmetic fixes

test=develop

* - Removed const_cast to obey coding standard

test=develop

* follow comments. test=develop

* Fix typo

* fix compile error. test=develop

* merge develop branch. test=develop

* Remove set_equal

* Polish code

* Delete unused functions

test=develop

* polish code. test=develop

* follow comment

* polish code.

* fix windows compile error. test=develop

* fix op handle.

* rerun ci. test=develop

* rerun ci. test=develop

* rerun macci. test=develop

* polish code. test=develop

* rewrite sort code. test=develop

* remove unused code. test=develop

* fix tests. test=develop

* fix conflict. test=develop

* follow comment. test=develop

* merge develop branch. test=develop

* fix tests. test=develop

* remove ToTypeIndex. test=develop

* rerun ci. test=develop

test=develop

test=develop

test=develop

* Enable ngraph tests for a ngraph engine
test=develop

* Move the test structure to other place
test=develop

* Add USE_NGRAPH flag, simple structure
test=develop

test=develop

* Add psroi_pool operator.

* add l2 unit test
test=develop

* code refine
test=develop

* fix nccl dist test acc test=develop

* fix test=develop

test=develop

* random failed. rerun ci. test=develop

* windows failed. rerun ci. test=develop

* add more log for dist test for ci test=develop

* increase deadline test=develop

Revert "Merge pull request #14798 from PaddlePaddle/revert-14786-revert-14782-revert-14398-imperative"

This reverts commit b1d3a1c8, reversing
changes made to f1fb64b1.

fix cmake
test=develop

add unittest model containing while_op
remove unnecessary codes
test=develop

* enable test_gradient_clip in mac
test=develop

* refine test_gradient_clip
test=develop