Merge pull request !1369 from ms_yan/del_storage

Merge pull request !1375 from cathwong/ckw_dataset_ut_cleanup5

Merge pull request !1377 from Tinazhang/cc

Merge pull request !1365 from h.farahat/text_namespace

Merge pull request !1308 from h.farahat/string_tensor2

Merge pull request !1249 from heleiwang/hlw_gnn_data

add support for MindRecord and TFRecord
----
optimize tensorshape

optimize tensorshape and FlatIndex

TFRecord and MindRecord support for string tensor

Modify mem layout
Add new constructor
Add method Allocate

Change some GetMutableBuffer usages to AllocateBuffer

Merge pull request !1341 from ZiruiWu/vocab_and_lookup

Merge pull request !1281 from Peilin/splitOp

Merge pull request !1342 from Tinazhang/cc

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 !1307 from cathwong/ckw_dataset_ut_unskip2

Merge pull request !1272 from JunhanHu/minddata_opt

-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 !1157 from ms_yan/concat_dataset

Merge pull request !1126 from xiefangqi/voc_support_detection

change to use __add__ operation instead ds.concat

Merge pull request !984 from Tinazhang/hwc2chw

Merge pull request !960 from EricZ/grayscale_fix

Merge pull request !507 from ZiruiWu/batch_with_padding

Merge pull request !951 from guozhijian/fix_read_by_columns