Demostration of cmake refine for HIP support.

* Temporarily fix bug for backward tanspiler when using parallel_do operator.

* Fix bug for backward tanspiler when using parallel_do operator

* Update index_en.rst

Update en version

* Update index_en.rst

Update refer to commits and thank you for the suggestion.

* Update index_en.rst

* Update index_en.rst

Update  refer to commits

* Add some contents

* Adjust the content of the English version

* Fix some error, replace word generate with build

* Replace document with documentation

* Adjust contents

* Make links more visible

Shrink batch_norm_grad's inputs

Build basic sphinx doctree for doc/fluid

Set WITH_DOC=ON in paddle/scripts/docker/build.sh and remove paddle/scripts/tools/build_doc.sh

Fix v2_pooling doc

Fix CI.

Add model average optimizer for fluid

Add float16 support to cudnn softmax kernel

Add float16 support to relu op

fluid distribute doc

Softmax MKLDNN FLUID operator

removed diagnostic

- Added Unit tests for Softmax MKLDNN Forward

Added fix for div by 0 to happen in cross_entropy backward

Conflicts:
	paddle/fluid/operators/CMakeLists.txt

- Cosmetic fixes to SoftMax MKLDNN fluid operator

Added misssing softmax fluid operator file

Disabled MKLDNN softmax operator by default

Fix to softmax op unittest merge

clang_formater fixes

clang_formatter fixes

- Name changing of softmax mkldnn operator to maintin consistency
  across codebase

- updated comment

fix to comment

Update index_en.rst

Add float16 support to batch norm operator

Multi-pass reader