We need this operator to assign value to a tensor and the values are stored in the program so that they can be used independent of python.

Feature/parallel for unittest

Feature/sync wait

Extend return value for layer functions

Make users can access parameters of layers and their gradients.

* add update graph method for memory optimization transpiler to avoid rebuild graph everytime

* clean code

* reset var desc if hit cache

Adversarial sample

Add sequence erase op

Async GRPC sendrecv

fix ds2 issue

auto set openblas env

Add edit distance operator

* init data_type_transform

* split data_layout_transform

* tmp rm data_transform_test

* change device_data_transform to data_device_transform

* clean code

* clean code

Polish GetPlacesOp

Enhence shrink_rnn_memory_op.

glog will not hold ARGV[0] inside.

feature/parallel_gpu