Merge pull request !2574 from TronZhang/codex_0624

add comment for control_depend

Merge pull request !2543 from amongo/FixApplyRmsprop

- It provides a unified style to express graph and kernel for user.
- It provides a unified IR to represent graph and kernel for developer.
- It breaks the boundary between graph and kernel.
- It provides more opportunities to do compile optimization.

Merge pull request !2276 from fary86/fix_eliminate_get_ref

Merge pull request !1833 from Giancarlo/pattern_matcher

Merge pull request !1975 from Kang/master

Merge pull request !1928 from yoonlee666/deletereshape

This reverts commit 705c71a257.

Merge pull request !1766 from vlne-v1/I1J0M0-amp-do-auto-cast-failed

Merge pull request !1578 from gengdongjie/master

Merge pull request !1385 from amongo/SupportMultiSwitch

This reverts commit 3db8cfa54f.

resolve review

Merge pull request !1359 from ZhangQinghua/master

Merge pull request !1250 from amongo/SupportDictSetItemTransform

format code

remove save_graph

raise exception when dictionary setitem if the key not exists

resolve error

remove unnessary op_

new subtree with 9 nodes and after that a Renormalize pass is needed to simplified it back to a tensor. The new algorithm will
create the tensor while visiting in the pass, therefore only a single node is created and no Renormalize will be needed for this pass
(if other passes requires then Renormalize will still be called but no further infer is needed for the created tensor)

Signed-off-by: Hoai Linh Tran h00472437 <hoai.linh.tran@huawei.com>

Code review

1. Remove the records of user graphs;
2. Remove the records of user value nodes;
3. Remove the records of user cnodes;
4. Add the records of users, and the API to access the users of graph, value node, and cnode;
5. Fix issue:User cnode record may point to its own graph, when combine the user(caller) and used one(callee);
6. Fix issue:User graphs never update itself after its first creation.

Merge pull request !662 from zhangbuxue/fix-reviewboot

This reverts commit ea6958c50a.

This reverts commit 252ed4f7c9.