* bnorm+relu fuse for mkldnn

* separate fuse_relu function

* bug fix

* proper while range in inference_transpiler

* description fix

* review fix

* review fix

* unit test for fwd batch norm+relu MKLDNN fuse

This reverts commit 4d8e8ee2, reversing
changes made to d6a9f005.

* Add sub_blocks of lr_decay_op to pserver_prog after distribute_transpiler

* Remove unused logs and logics

* 1. Add ops to new block (considering the nested block condition)
2. Follow the original hierarchy of blocks
3. Change the function's name and remove debug lines

* fix mac build error

* enhance memory optimize transpiler to let users set to some skip opt set of variables

2. replace split_method with slice_var_up in func init_splited_variables

2. Merge the develop repo

* WIP move weight decay

* weight decay ok

* wip

* clean up transpiler

* add details folder

* update

* fix split var test

* follow comments

2. add align_var_to_block argument to func transpile
3. remove concat and spilt if align_var_to_block is False
4. unittests for simple_dist_transpiler