Merge pull request !1873 from yanghaoran/master

Merge pull request !1874 from h.farahat/string_tensor_updates

- Support accepting Numpy of str as input
- Support batching strings
- Core logic of batch&pad is static
- Make Pad a utility function

This reverts commit 705c71a257.

Merge pull request !1911 from lianliguang/add-a-function-to-charge-the-node-input-or-output-if-is-a-scalar

Merge pull request !1774 from liyong126/mindrecord_padded_sample

Merge pull request !1615 from amongo/GetBoolValueFromConstantTensor

Merge pull request !1767 from huanghui/LayerNormGrad-split-pass

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

updates

more update

more work

more fixin

post rebase updates

clang formatting

code review recovery

ci fixes

updates

update

update

update

Merge pull request !1777 from BowenK/master

Merge pull request !1696 from huanghui/TMP

Merge pull request !1532 from jinyaohui/pylint1

Merge pull request !1692 from meixiaowei/master

Merge pull request !1666 from huanghui/AdamApplyOneWithDecay-fusion-pass

Merge pull request !1578 from gengdongjie/master

Merge pull request !1568 from seatea/fix-pylint-warning

Merge pull request !1433 from leopz/tensor_base

This reverts commit 3db8cfa54f.

Merge pull request !1505 from huanghui/stride-slice

pynative.

Merge pull request !1453 from Alexey_Shevlyakov/fix_random_crop_decode_resize_ut

Merge pull request !1383 from amongo/KeepPrimAttrInCNode

Merge pull request !1271 from yangjie159/refactor_memreuse_allocator

Merge pull request !1490 from seatea/fix-pylint-warning

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