Merge pull request !1250 from amongo/SupportDictSetItemTransform

Merge pull request !1282 from jiangjinsheng/vm_prelu

Merge pull request !1263 from Kang/master

Merge pull request !1125 from jiangjinsheng/space_to_depth

Merge pull request !1269 from wenchunjiang/fix_task_sink_bug

Merge pull request !1189 from leopz/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 !1231 from zhoufeng/label-assign

Merge pull request !1228 from liuxiao/UnsortedSegmentMin

Merge pull request !1224 from JichenZhao/squaresumall

Signed-off-by: zhoufeng <zhoufeng54@huawei.com>

Merge pull request !1209 from liubuyu/master

Merge pull request !1218 from jinyaohui/pylint1

Merge pull request !1187 from yangzhenzhang/ckpt-and-restore-parameter-shape

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 !1061 from jiangzhiwen/dataset/flat_map

Merge pull request !1120 from Kang/master

Merge pull request !1180 from YuJianfeng/master

Merge pull request !1118 from huanghui/batchnormgrad-to-bninfergrad-pass