Merge pull request !1968 from jiangjinsheng/vm_FusedMulApplyMomentumExtern

2. mod cora and citeseer conversion script

Merge pull request !1916 from lilei/add_proximal_ada_grad_optimizer

Merge pull request !1957 from jiangjinsheng/issue_merge

Merge pull request !1933 from yoonlee666/edit-example

Merge pull request !1888 from YuJianfeng/adam

Merge pull request !1946 from lichen/remove_autoparallel_st

Merge pull request !1873 from yanghaoran/master

Merge pull request !1874 from h.farahat/string_tensor_updates

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

- 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