Add a multi-dim add layer test.

Bump MKL-DNN version

V2 deadlinks

* init refactor

* init

* update some comment

* fix build

* fix errorrr

* fix bug

* fix comment

* update

Fix typo in wmt16

We need to figure out if tensorrt
use row-major or col-major for tensor
layerout inorder to do conversion.

Fix fetch_op_handle

Fix CI 

Fix some image deadlinks in fluid documentation

Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into deadlint push origin deadlinks

Add classification_cost to v2 documentation

* refine the document

* Update README.md

refine io_convert and op_convert

* change to readme

* Update README.md

* Save the base of the new test.

* Create the notest_recognize_digits_conv and notest_recognize_digits_mlp

* precommit check

* Change the function name from _network to _program.
Update several variable names to make them more consistant.
Update the Inferencer construction call.

* Fix the incorrect format.

* Add label semantic examples with new api

* Address review comments

* Address review comment