fix test resnet50 multi-threading on mkldnn

* fix nccl2 lars dist support

* put lars in momentum op

* add tests lars

* fix ci

* fix cpu kernel

* soft warning

* remove lars in test_recognize_digits.py

* move to another op

* add file

* update api.spec test=develop

* update test=develop

* fix api.spec test=develop

* wip

* wip, finish grad merge ops

* wip, finish graph build

* wip test running

* work on 1 gpu

* workable version

* update

* fix tests

* fuse broadcast op

* fix compile failed

* refine

* add batch merge test mnist

* fix CI test=develop

* fix build

* use independent bn params for batch merge test=develop

* update api.spec

* follow comments and for test

* wip

* refine tests test=develop

* follow comments test=develop

* remove startup bn modify test=develop

* follow comments test=develop

* fix merge test=develop

delete unused codes.

Fix EditDistanceMetrics API bug

[1.1] Add hash_op implementation

[1.1] Accelerate sparse embedding grad op in CPU device

test=develop

test=develop

test=develop

test=develop

* fix graph num hang test=develop

* re-enable tests test=develop

* re-enable graph num check test=develop

* fix multi device pass role check test=develop

Refine detection mAP in metrics.py.

[1.1] remove unused code in paddle_inference_api.h

[1.1] fix python encoding problem in wmt16 related test

Add sequence_reverse_op

[1.1] fix erase end in generate proposals op

[1.1] Make reshape_op reuse input.

[1.1] Fix ubuntu dockerfile

Unify API of mixed_vector in GPU and CPU

Fix threadpool

test=develop

remove unused method from naive executor

Add dropout att new 1.1 merge

test=develop

test=develop

test=develop

fix multi device dependency issue

test=develop

test=develop

test=develop

disable dist transformer

test=develop