Merge pull request !1808 from Jamie/numsamples

* 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 !1851 from YuJianfeng/bn_cast

Merge pull request !1810 from sunsuodong/optimize_performance

Merge pull request !1823 from jiangjinsheng/vm_ConfusionMatrix

Merge pull request !1819 from zhangbuxue/restricting_modify_non-Parameter_class_members

updates

more update

more work

more fixin

post rebase updates

clang formatting

code review recovery

ci fixes

updates

update

update

update

Merge pull request !1806 from Tinazhang/random-crop-error-msg

Merge pull request !1804 from wangqiuliang/add-tensor-compare-len-consexpr-feature

Merge pull request !1753 from Xiaoda/implementing-embeddinglookupgrad-operator-2

Merge pull request !1618 from baihuawei/cpulstm

Merge pull request !1800 from sunsuodong/fix_StrideSliceGrad

Merge pull request !1801 from wanghua/master

Merge pull request !1713 from luoyang/pylint

Merge pull request !1769 from lichen/gatherv2_support_host_and_device

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

Merge pull request !1697 from chenhaozhe/bert-optimization

Merge pull request !1777 from BowenK/master

Merge pull request !1714 from huanghui/SoftmaxGradExt-fussion-pass

Merge pull request !1762 from zhangbuxue/support_convert_bool_scalar_and_tensor_to_number_tensor

Merge pull request !1685 from Xiaoda/fix-the-embeddinglookup-bug

Merge pull request !1750 from zhouneng/add_vm_support_for_expm1

Merge pull request !1415 from kisnwang/support-mix-target