* Hidden APIs for While, StaticRNN, ParallelDo.

Ir pass

CheckTensorNANOrInf support checking SelectedRows

* cherry picked

* "cherry picked platform"

* "add comment"

* "fix ci"

Fix dist seed

fix SERIAL tests

better test

properly set up dep of concat and fetch_bar

Fix inference api impl deps

add distributed training deps.

Fix grpc destroy bug

fix fluid_benchmark.py

unify libpaddle_inference_api and libpaddle_fluid

* add flatten op

* enable dist se resnext

* small batch size

* refine regularization for selected_rows

* clean lookup_table

* refine rpc_server_test

* temporally disable rpc_server_test

* fix rpc_server_test

* add unit test

Add tensorrt pooling converter

refine num_threads control

Add self to author

update inference_optimize() to support program with readers

fix cudnn enforce