Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into dist-lookup-table-only-support-sgd

avoid duplicated init op for one parameter

* fix the result of unit test

* fix resnext

* compare the result of PE and Exe

* compare the result of reduce and allreduce

* Simplify the travis script.
Now use docker to deploy documentations

* Check for the pull request

* Update paddle_build.sh

* Update paddle_build.sh

optimize profiler

Bugfix/disable anakin test

Make lookup_table_op and softmax_op supporting high rank tensor

enforce test_parallel_executor_transformer and test_image_classification_resnet to run in serial (#12545)

Improve profiler

Fix pserver can NOT start with DebugString problem

fix: add batch size check in loading data process

Add tensorrt elementwise add