Merge pull request !2776 from ZiruiWu/master

Merge pull request !2996 from fanglei/add_testcase_switchlayer

Merge pull request !2912 from fanglei/msssim

Merge pull request !2976 from YuJianfeng/input2output

Merge pull request !2980 from nhussain/empty_column_b

Merge pull request !2961 from JoyLvliang/add-st-to-protect-pynative-hook-from-abnormal

Merge pull request !2962 from chenweifeng/smoothl1loss

Merge pull request !2972 from zhangbuxue/Improving_implicit_type_conversion

Merge pull request !2923 from Giancarlo/update_arith_simplify

Merge pull request !2798 from hewei/decouple_param_value

Merge pull request !2975 from Kang/add_AbstractKeywordArg

add test caser

fix ci

address review cmts

ci

addr review cmt

fix typo

address review cmts

add 2 more test cases

cpplint fix

addr cpplint

addr ci

fix tst case err

fix doc str

Merge pull request !2982 from ava/CPP_test3

Merge pull request !2947 from danishnxt/AugOps-testing

fix cmakefile

fixed log statments in cpp UT tests

Merge pull request !2938 from ZhangQinghua/master

Merge pull request !2958 from ZPaC/add-ps-module

This reverts commit 02dd305bb0.

Merge pull request !2779 from chenweifeng/ctcloss

Merge pull request !2765 from fary86/fix_large_for_loop

Merge pull request !2915 from Xiaoda/8-move-embeddinglookup-external

Merge pull request !2946 from EricZ/emtpy-tensor

Merge pull request !2926 from islam_amin/object_ops_cc_ut_floats

new test case

Name change for empty check

fixed random_apply tests

fix validators

fixed random_apply tests

fix engine validation

Merge pull request !2892 from tony_liu2/master

Merge pull request !2922 from ava/float_change

Merge pull request !2605 from XunDeng/pp_poc_v3

Merge pull request !2887 from JoyLvliang/back-to-fusedbatchnorm-operation-in-pynative-mode

Merge pull request !2869 from jinyaohui/master

Merge pull request !2816 from Kang/optimization