* Sigmoid bug fix, test=develop

* fix code format

test=develop
Co-authored-by: NManjunath Bhat <manjunathbhat9920@gmail.com>

* add hdfs ls retry time and sleep time, fix save inference
* test=develop

* fix copy table bug of lost some feasign
* test=develop

* add int16 support, test=develop

* add test, test=develop

* fix typo, test=develop

* fix dtype error in slice, test=develop

* fix chain doc, test=develop, test=document_preview

* fix bug with half communicator

* update the ut precision of pad pad2d pad_constant_like from fp32 to fp64, test=develop

* add GeneralRoleMaker which is for general usage
* test=develop

* Enable quantize to reorder to nchw as well

* Correct FC MKL-DNN input dim requirements to accept 3D

* Improve DNNL FC format, error and 3D input handling

test=develop

* Improve error checking in FC

test=develop

* Improve PADDLE_ENFORCE messages in fc-related files

* Remove data layout attribute from obligatory pass args

test=develop

* Fix message in fc_mkldnn_pass to be logically correct

test=develop

remove unnecessary template.

* add no_grad_set value check in op_test, test=develop

* update ops list, test=develop

* test=develop, fix geo Send & Init

test=develop

* remove skip_check in test_activation_mkldnn_op, test=develop

* modify lite commit id to support var_conv_2d cascade. test=develop

* modify lite commit id. test=develop

* polish backward prune, test=develop

* fix control flow op bug, test=develop

* add some unittests, test=develop

* fix unittest args, test=develop

* follow huihuang's comments, test=develop

* fix dataloader early reset bug, test=develop

* change implementation, test=develop

* fix ut, test=develop

* use function instead of lambda, test=develop

* follow comments, test=develop

* update external lite, test=develop

* switch WITH_TESTING to OFF, test=develop

fix timeout of test_dist_fleet_geo