Merge pull request !411 from Simson/push-to-opensource

Merge pull request !402 from yangzhenzhang/square

Merge pull request !417 from anzhengqi/fix-commit-format-error

Merge pull request !408 from ZhouFeng/cmake317-windows

Merge pull request !413 from chenjianping/eliminate-securec-warning

Merge pull request !383 from zhaozhenlong/cell/psnr

Merge pull request !286 from wangqiuliang/resolve-pynative-operator-issue

Merge pull request !378 from h.farahat/multi_itr

-- Iterator list is keeping  all created iterators wihtout cleaning them up
-- alter tree modifies the original.

Merge pull request !377 from h.farahat/end_iterator

Merge pull request !183 from JunhanHu/cpp_sampler

Merge pull request !397 from chenjianping/building-on-windows-3

Merge pull request !296 from StrawNoBerry/ExcludeFV

Merge pull request !396 from zhangbuxue/fix_example_of_controldepend_for_cpu_and_gpu

Merge pull request !398 from penn/fix_example_doc_of_insert_grad_of

Merge pull request !391 from Simson/push-to-opensource

Merge pull request !386 from changzherui/modify-ut

Merge pull request !388 from Maoweiyong/fix-gpu-op-register

Merge pull request !343 from amongo/FixGradUsingInterfaceExtend

Merge pull request !314 from VectorSL/assign

Merge pull request !392 from caifubi/use-graphid-as-key-in-ascend-kernel-runtime

Merge pull request !217 from zhangbuxue/support_pow_operator

!332 Fixing problems including class slice example in ME cannot run, adding an example for class SigmoidCrossEntropyWIthLogits in ME etc.
Merge pull request !332 from zhangzheng/master

Merge pull request !379 from JichenZhao/groupnorm

Merge pull request !382 from yangzhenzhang/sigmoidloss

Fixing problem issues including class slice example cannot run, adding an example for class SigmoidCrossEntropyWithLogits etc.