* add distributed auc

* add attr "is distributed" and config it

* add distributed auc

* add batch auc and code format

* code format

* auc optimize

* metric_op optimize

* code clean

* bug fix and code clean

* bug fix and code clean

* code optimize

* code optimize

* api spec update

* Comments optimized

* add mutex

* Revert: add mutex

* remove distribute metric

* remove distribute metric

* spec modifyed

* add annotation, test=develop

* keep API compatibility
test=develop

Cherry-pick from develop

fix doc cmake in release/1.0.0

test=release/1.0.0

disable nccl2 test on CPU only mode

only mode

* mac ci make install fix

* fix build

* update

* update

[Urgent] Add out params to some apis

clean a few more kwargs

Hide parameter

Move trainer to contrib

fix table grad send sync_mode

* generic cmake

* Update generic.cmake

* add nccl2 dist api

* update apispec

* update

* update api spec

* add guide

* "fix doc"

* Update windows_inference.md

Looks like there is a little problem in markdown format writing of head lines

Remove kwargs in softshrink

fix links in readme

fix roi_perspective_transform_op.cc unused variable caused error on Mac

fix img_conv_group doc

Remove kwargs in elementwise layers and scale layer

disable memopt test

 remove kwargs of some activation api

* add ShareLoDs

* refine

* add Is EmptyVarName

* refine Sharedlod