From: @yao_yf
Reviewed-by: @yangzhenzhang,@stsuteng
Signed-off-by: @stsuteng

1. set class GraphKernel as deprecated, and treat it as Cell
2. set class InplaceAssign as deprecated, suggested using Assign instead.
3. set op_selector as deprecated, removed the _selected_ops and _selected_grad_ops, replaced with real operations
4. removed the two passes of GraphKernel from frontend
5. removed the GraphKernel's codes from other modules

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

From: @linqingke
Reviewed-by: @guoqi1024,@xu-yfei
Signed-off-by: @xu-yfei

add gc.

remove gc in less_bn

[Less BN]Add GC optimizer.

update format.

fix bug.

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

free

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

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

From: @linqingke
Reviewed-by: @zh_qh,@guoqi1024
Signed-off-by: @guoqi1024

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

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

Replace US with its monad input in DeleteLoadUserUpdateState().

From: @tronzhang
Reviewed-by: @gaoxiong1,@gaoxiong1,@dylangeng
Signed-off-by: @dylangeng

From: @linqingke
Reviewed-by: @guoqi1024,@xu-yfei
Signed-off-by: @guoqi1024

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

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

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

From: @zhoufeng54
Reviewed-by: @kisnwang,@xu-yfei
Signed-off-by: @xu-yfei

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

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

Move auto monad eliminator out from CSE.
Eliminate auto monad nodes for output node.

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