Add label smooth operator.

* Initial commit

* Remove resolution bug

* Modify IsParam

* Remove small bugs

* First commit unifying Run and Load

* Fix bugs

* Fix Cmake

* Modify Cmake and dir structure

* Add io.* files to inference dir

* Fix include in example

* Address review comments: part 1

* Address review comments: round 2

* Address review comments: round 3

* Address review comments: round 4

Refine debug string of Parameter

Fix 5902

* refine channel test

* follow comments

* Add dependency enforce to threadpool

* Revert changes to channel_test.cc

* Revert changes to channel_test.cc

* Add #include "paddle/framework/macros.h"

Remove unreferenced variables from ProgramDesc in prune()

Bug fix for sequence_reshape operator.

Add weight normalization wrapper.

add docstring for set_gradient_clip

* initialize batch barrier

* add some comments

* update

* fix batch barrier

* use sendvariable rpc interface to send batch barrier

* fix comment

* fix method

* fix by comment

* fix by comment

Add build_type to build.sh

Feature/Recv op python with guard

* Remove IsBounded as buffered channels have to be bounded

* Add derived classes Buffered and UnBuffered"

* Implement buffered and unbuffered channels

* Correct the syntax of Channel::Receive

* clang-format

* clang-format 3.8

* clang 3.8

Add python api for lstmp operator

* fix typo

* fix typo

Add DataTypeToString

Update copyright for notest_dist_image_classification 

Fix the decoder_boot in test_rnn_encoder_decoder.py

* Polish threadpool

* Add #include <vector>

* Rename variables

* Rename variables

* clang-format