fix SyntaxWarning in wmt16.py

* refine conv2d_transpose layer doc

* fix conv2d_transpose doc

* fix doc

Register reduce_op_kernel with multiple data types

Add bipartite matching operator and unit testing.

fix rendering error of transpose operator and add wrapper.

Add im2sequence op.

* Updating the cluster trainign doc

* Fixed few comments of transpiler

* Adding few explanations

* Updating the cluster trainign doc

* Fixed comments

* Updating few comments in recv_op

update gradient clip api

compile and install the shared library of fluid inference

remove unused v1 api doc

Add python wrapper for  CTC greedy decoder and edit distance evaluator

Fix CI

Add v2 get layer out in FAQ

2. Fix evaluator using 'reduce_sum' op instead of 'mean' op

fix copyright