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

resolve review

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

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 !1277 from liuwenhao/master

Merge pull request !1447 from yihuaijie/master

Merge pull request !1419 from Etone.Chan/Resnet50

Merge pull request !1427 from panyifeng/fix_check_bprop_attr_error

Merge pull request !1454 from JesseKLee/zirui

Merge pull request !1455 from cathwong/ckw_dataset_config_util

Merge pull request !1379 from Tinazhang/linearTrans

Merge pull request !1406 from JesseKLee/CondVar

Merge pull request !1414 from zhaozhenlong/fix-issues-reshape-replace-flattern-grad

Merge pull request !1400 from huanghui/TMP

Merge pull request !1300 from liuxiao/RangeD

Merge pull request !1424 from yihuaijie/master

Merge pull request !1359 from ZhangQinghua/master

Merge pull request !1160 from wangqiuliang/add-backward-hook-in-pynative-mode

Merge pull request !1389 from h.farahat/fix_security_issues