update alexnet inference benchmark data on MKL

fix inference crash of alexnet benchmark

add paddle version of pip install and docker

* add helper function to get appropriate DeviceContext

GemmConvMobileFunction(optimized for mobile)

auto set openblas env

Feature/check nan executor

Feature/is nan

fix build link rt

update md5 of flowers dataset

* Run interface return future

* delete unused comments

fix some warning

* implement selectedrows serialize and deserialize

* make serialize/deserialize as global function

* recover send_imp.cc

* delete unused brackets

* fix compile error

* serialize version in LodTensor and SelecetedRows

* fix ci

* fix ci

move ENFORCE position