implementation 99% complete

everything and tested except for repeatable shuffling

tested most basic/typical split usecases

cleanup

some more cleanup

fix CI

more ci fix

more ci fixes

more ci fix

more ci fix

more ci fix

added more tests, fixed some bugs

some more clean up and test cases

added shard/shuffle before split warning/error

addressed code review comments and ci

fixed ci

Merge pull request !1188 from panyifeng/fine_tuning_mindspore_test_framework

Merge pull request !1170 from yangjie159/fix_memreuse_to_support_large_batchsize

Merge pull request !1192 from h.farahat/string_Tensor

Merge pull request !1186 from wenchunjiang/construct_kernel_graph

Merge pull request !972 from seatea/fix-cse-bug-for-random-effect

Merge pull request !1166 from wukesong/add-dy-lr

Merge pull request !1129 from zhaozhenlong/op/bounding-box-encoder

Merge pull request !1203 from changzherui/code516

Merge pull request !1176 from jiangjinsheng/issue_transpose

be optimized as it will generate different values each time.

Merge pull request !804 from huanghui/fix-confusionmulgrad-fusion-pass

Merge pull request !1195 from jiangjinsheng/issue_geswitch

Merge pull request !1172 from Chong/support_squeeze_and_reduce

Merge pull request !1199 from caifubi/fix-profiling-core-dump

Merge pull request !1100 from jinyaohui/context_opt_2

Merge pull request !1196 from ms_yan/concat_format

iou

NMSWithMask

larsupdate testcase

sgd testcase

Merge pull request !1184 from wangcong/master

Merge pull request !1138 from JoyLvliang/pynative-fix-topk-run-failed

kernel_graph from root func_graph

Merge pull request !1178 from zhouneng/add_vm_support_roialign

-replace switch'case by indexing

- Add test case
- Add constructors
- Add getItem string

- Fix bugs
- Add more tests

- Tensor iterator
- asNumpy
- TextFileDataset

- Tensor(Numpy)

- Super > 2D
- Add more test cases for GeneratorDataset

- Change StartAddr to GetBuffer and GetMutableNuffer

- Raise an error if batch is used with strings

Clean-up work

Merge pull request !1191 from ms_yan/map_column

Merge pull request !1061 from jiangzhiwen/dataset/flat_map

Merge pull request !1162 from lianliguang/using-device-dtype-to-create-transdata-kernel-build-info

Merge pull request !1120 from Kang/master