Merge pull request !1920 from amongo/SupportPynativeIndexing

support tensor slice using constexpr

remove tensorslice metagraph

add pynative testcases

Merge pull request !1944 from wangqiuliang/move-hook-function-to-primitivepy

Merge pull request !1968 from jiangjinsheng/vm_FusedMulApplyMomentumExtern

Merge pull request !1873 from yanghaoran/master

Merge pull request !1945 from vlne-v1/I1JXUP-resnet50-thor-assign-fail

Merge pull request !1678 from jinyaohui/print

Merge pull request !1865 from JichenZhao/bnops_for_vm

* add infer_value for common math ops
* convert constant bool tensor to bool value

* do not infer value when encounter 0 as division

for while condition, do not unrool if condition is a tensor

Merge pull request !1766 from vlne-v1/I1J0M0-amp-do-auto-cast-failed

Merge pull request !1762 from zhangbuxue/support_convert_bool_scalar_and_tensor_to_number_tensor

Merge pull request !1750 from zhouneng/add_vm_support_for_expm1

Merge pull request !1695 from liuwenhao/master

Merge pull request !1682 from liuxiao/SparseApplyProximalAdagradD-SparseApplyFtrlD-ApplyProximalAdagradD

Merge pull request !1528 from jiangjinsheng/vm_bessel

Merge pull request !1532 from jinyaohui/pylint1

Merge pull request !1488 from fangzehua/fzh_edit

Merge pull request !1257 from candanzg/implicit_type_conversion2

Merge pull request !1385 from amongo/SupportMultiSwitch

Merge pull request !1530 from zhangbuxue/support_tensor_getitem_number_value_type_similar_as_tensor_dtype

Merge pull request !1508 from zhaozhenlong/op/bitwise-and-or-xor

Signed-off-by: candanzg <zhangshucheng@huawei.com>