* Add survey of support of half in different CUDA versions

* small fix

My unpool max 2d

fix conv and conv_trans op doc

* Make param_attr as a strong typed class

Fix #5819

Small fix in profiler.py of fluid.

Fix gru_op related code style

* fix compile on cudnn7

* update

* update

* make silent

* refine install docs

* do not remove files

* follow comments

* update

Add CUDA profiler tools in new framework.

Update the content of design doc for distributed architecture

* Adding log loss operator

* Removing comments

 Add size, height and width for crop layer and switch order layer.

Update the write_docs_en.rst and write_docs_cn.rst to include how to run the documentation viewer tool without Docker
Add dev/contribute_to_paddle_cn.md onto navigation link

Fix useGpu in HierarchicalSigmoidLayer

Fix hsigmoid_layer  when using GPU.

* batch norm support matrix input

* update gpu code

* format code

* Make 'scale_op' supporting int and int64

* refine .cu file

* Fix MacOS compile

* Update GRPC

* Unset PROTOBUF_EXEC

* Add Python wrap of conv2d_transpose and its unittest

* Follow comments

* Fix format

* Unify fluid submodules to fluid module

Change books just use `import fluid`, not submodules

* Remove g_main_program/g_startup_program

Use default_main_program/default_startup_program instead

* Typo

* Fix CI