Merge pull request !1250 from amongo/SupportDictSetItemTransform

Merge pull request !1282 from jiangjinsheng/vm_prelu

Merge pull request !1263 from Kang/master

format code

remove save_graph

raise exception when dictionary setitem if the key not exists

resolve error

remove unnessary op_

Merge pull request !1111 from jiangjinsheng/vm_pack

Merge pull request !1228 from liuxiao/UnsortedSegmentMin

Merge pull request !1218 from jinyaohui/pylint1

Merge pull request !1192 from h.farahat/string_Tensor

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

Merge pull request !1195 from jiangjinsheng/issue_geswitch

Merge pull request !1100 from jinyaohui/context_opt_2

iou

NMSWithMask

larsupdate testcase

sgd testcase

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 !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 !1171 from fary86/adjust_onnx_related_uts

Merge pull request !1015 from candanzg/me_with_shape

Merge pull request !1026 from peixu_ren/custom_pp_ops

Merge pull request !1084 from SanjayChan/04quant

Merge pull request !1089 from ghzl/add-get-lr-base-on-parameter