add CaseFold, NormalizeUTF8

add RegexReplace

add RegexTokenizer

add BasicTokenizer

add WordpieceTokenizer

add BertTokenizer

Merge pull request !2184 from xiefangqi/xfq_fix_coco_issue

Merge pull request !1977 from JonathanY/randomwalk

Merge pull request !2026 from MahdiRahmaniHanzaki/I1K3FL-random-resized-crop

Merge pull request !1913 from xiefangqi/xfq_support_coco

Merge pull request !1908 from Tinazhang/ut-normalize

2. mod cora and citeseer conversion script

Merge pull request !1544 from MahdiRahmaniHanzaki/I1IHNG-ten-crop

Added unit tests for both testing the functinality of the TenCrop and
its error messages. Due to the similarity of this method to FiveCrop the
test cases are similar to FiveCrop test cases.
Signed-off-by: Mahdi <mahdi.rahmani.hanzaki@huawei.com>

added error_msg function call in the main method

refactored the test and added visual representation of the results

Separated the two error cases into two different functions and used the
visualize function in util.py to plot the result of TenCrop.
Signed-off-by: Mahdi <mahdi.rahmani.hanzaki@huawei.com>

Added new test cases

Added new test cases including test case for checking the error message
when the size variable is not a positive integer, test case for
rectangle crop, test case for vertical flip setting, and testing for
similarity of the result of TenCrop for the same input data in different runs.
Signed-off-by: Mahdi <mahdi.rahmani.hanzaki@huawei.com>

changed visualize in test_five_crop

Changed the visualize function in test_five_crop to use the already
existing function in util.py
Signed-off-by: Mahdi <mahdi.rahmani.hanzaki@huawei.com>

made generate_golden variable global

Merge pull request !1379 from Tinazhang/linearTrans

Merge pull request !1365 from h.farahat/text_namespace

Merge pull request !1308 from h.farahat/string_tensor2

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 !1126 from xiefangqi/voc_support_detection

Merge pull request !984 from Tinazhang/hwc2chw

Comparison example

Added md5 and comparison example for py_transforms

Added md5 check for images

Merge pull request !406 from Peilin/first-row-crc-check