- 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 !1905 from baihuawei/cpulstm

Merge pull request !1101 from chentingting/gcn

Merge pull request !1741 from wenkai/wk1_cpu_summary_0531

Merge pull request !1862 from jiangjinsheng/issue_doc

Merge pull request !1902 from chenhaozhe/fix-bert-scripts

Merge pull request !1831 from ghzl/add-oder-parameters-in-group-functions

Merge pull request !1824 from huanghui/single-batchnorm-fission-pass

Merge pull request !1678 from jinyaohui/print

Merge pull request !1865 from JichenZhao/bnops_for_vm

Merge pull request !1787 from chujinjin/optimize_transdata_for_pynative

Merge pull request !1826 from wangnan39/fix_lr_check_bug_in_adamweightdecay_dynamic_lr

Merge pull request !1853 from amongo/FixInitializer

Merge pull request !1774 from liyong126/mindrecord_padded_sample

Merge pull request !1615 from amongo/GetBoolValueFromConstantTensor

Merge pull request !1838 from YuJianfeng/master

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

Merge pull request !1807 from ZiruiWu/ngram_dev

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