Merge pull request !1446 from liuxiao78/master

Merge pull request !1383 from amongo/KeepPrimAttrInCNode

Merge pull request !1472 from yihuaijie/master

Merge pull request !1477 from jiangjinsheng/BatchToSpaceND

Merge pull request !1271 from yangjie159/refactor_memreuse_allocator

Merge pull request !1480 from panfengfeng/iterator_gpu_weak_ref

Merge pull request !1457 from Peilin/splitOp-after-testing

Merge pull request !1443 from yangzhenzhang/add-sigmoid-op

Merge pull request !1490 from seatea/fix-pylint-warning

add another test case

typo

merge conflict

another PR changed testing behavior, updated test cases in this commit

added input check for use_sampler

addressed code review comments

fixed pylint, not related to my changes

Merge pull request !1466 from zhouneng/add_vm_support_Atan2_ExtractImagePatches

Merge pull request !1487 from sunsuodong/addn

Merge pull request !1484 from SanjayChan/mobilenet

Merge pull request !1483 from zhoufeng/code-clean

Merge pull request !1353 from yanzhenxiang2020/add_topk_datatype

Merge pull request !1474 from YuJianfeng/master

Merge pull request !1479 from liubuyu/master

Merge pull request !1452 from caojian05/ms_master_dev

remove stream id from membuf
add kernel dependence to determine whether is usable

Merge pull request !1476 from wenchunjiang/fix_reshape_type_bug

Merge pull request !1459 from zhoufeng/link-assign

modify infer to get abstract value and attr value map together

support get attr in specialize

clone primitive when specialize if attribute is not the same with
infered attribute

Merge pull request !1465 from h.farahat/fix_compilation_order