The basic idea is: exploits data dependency to control the execution order
of side-effect operations, and keep the semantics of ANF unchanged.

The ControlDepend primitive is removed and there are two primitives added:

1. UpdateState:
```
  a = Assign(para, value)
```
became:
```
  a = Assign(para, value, u)
  u = UpdateState(u, a)
```

2. Load:
```
  x = Add(para, value)
```
became:
```
  p = Load(para, u)
  x = Add(p, value)
  u = UpdateState(u, p)
```

From: @bai-yangfan
Reviewed-by: @c_34,@guoqi1024
Signed-off-by: @c_34

Merge pull request !6643 from linqingke/modelzoo

Signed-off-by: Ting Wang <kathy.wangting@huawei.com>

Merge pull request !6267 from zhaoting/clean_warnings

Merge pull request !6208 from wangmin0104/master

Merge pull request !5768 from linqingke/fasterrcnn

change ImagefolderDV2 name

change ds.transforms.vision to ds.vision

change batch api to match map api more closely

compose op changes

test_pylint

remove compose op from vision, move to transform module, refactor map and batch to use column_order

Merge pull request !5837 from lichen/rectification_allreduce_fusion_api

Merge pull request !5748 from wangmin0104/master