From: @Margaret_wangrui
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

From: @huangbingjian
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

From: @lanzhineng
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

From: @Margaret_wangrui
Reviewed-by: @zh_qh,@ginfung
Signed-off-by: @zh_qh

From: @chenfei52
Reviewed-by: @zh_qh,@ginfung
Signed-off-by: @zh_qh

From: @lanzhineng
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

From: @liangzelang
Reviewed-by: @zhoufeng54,@kisnwang
Signed-off-by: @kisnwang

Fix 'Useless super delegation in method __init__';
Also fix class naming problem.

From: @Margaret_wangrui
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

add testcases 2

From: @chenfei52
Reviewed-by: 
Signed-off-by:

1. Remove output parameter pool for ascend control flow;
2. Remove duplicate code for Switch and SwitchLayer;
3. Add 'return' attribute to label_goto that used for return;
4. Disable tail call optimize for graphs with 'recursive' flag.

From: @liangzelang
Reviewed-by: @jjfeing,@zhoufeng54
Signed-off-by: @zhoufeng54

Merge pull request !5172 from riemann_penn/remove_name_args_from_gradoperation

Merge pull request !3271 from vlne-v1/ref_demo

Merge pull request !5011 from riemann_penn/remove_global_grad_ops

add testcase of net of if by if

add testcase of st

add join for ref

adjust env eliminate to eliminate all env ops

add partial app cache

resolve while endless

fix env eliminate

support for "for while" cases

fix join shape error

insert assign at the end of graph

clear log

clear log 2

handle replace call of unreuse args

handle bug of replace node

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

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