cherry-pick from develop

Disable GraphNum_Check

test=release/1.1

Merge pull request #14123 from shippingwang/fix_import_plot_py3

Fix import plot in py3

test=release/1.1

cherry pick 13766

Merge pull request #14055 from dzhwinter/fix/mem_opt

Merge pull request #14103 from jacquesqiao/cpu-for-1.1-merge-with-shape

cherry-pick 1.1 fix cmake warning when ON_INFER=false

Merge pull request #14107 from jacquesqiao/fix-xxhash-compile-on-mac

OrderSet default is mutableSet, not set.

test=release/1.1

* 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

test=release/1.1

fix xxhash compile on macos

test=release/1.1

[1.1] Cpu for 1.1 merge with shape

test=release/1.1

test=develop

test=develop

[1.1]Fix op_role value

test=release/1.1

[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

remove unused method from naive executor