Because of the changing trt engine op from gpu to gpu mode.

(cherry-pick from commit 145b20c160329428c1ec05c94287708aa1ed6f63)

cherry-pick from commit 133ec696

(cherry picked from commit 1600ba86)

fix bug to avoid warning once import paddle.fluid

Merge pull request #12780 from panyx0718/ir4

fix sparse update bug

fix ProgramToGraph

(cherry picked from commit e525aa23)

Fix flowers dataset download problem

update native_infer.rst

Cherry pick add dependency to send recv

* dist transpiler add control dependency var between send and recv

* fix async deps

* follow comments and refine

* fix deps connect for rpc ops

Add dependency to send recv

* Disable in_place in batch_norm API.

Cherry pick rw lock

* add rw lock test

* optimize read_write and wirte_read test

Optimize selected rows for dist lookup table with rwlock 

This reverts commit bf3c3496.

disable anakin when cuda < 8.0 or cudnn < 7.0

add mklml depends for anakin

Sampling id op

Port print_function and make more efficient

Port pybind11 and python code to support py3 CI test

Add libpng dependencies to yum and correct libnccl dir

Refine gru cpu forward

Error message refine: add demangle api to attribute type