From: @dinglinhe123
Reviewed-by: @wuxuejian,@liangchenghui,@liangchenghui
Signed-off-by: @wuxuejian,@liangchenghui,@liangchenghui

From: @wangyanling10
Reviewed-by: 
Signed-off-by:

From: @jiangzg001
Reviewed-by: @tom__chen,@liangchenghui
Signed-off-by: @liangchenghui

From: @gong_zi_yan
Reviewed-by: @stsuteng,@yangzhenzhang
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: @ding_fei_fei
Reviewed-by: 
Signed-off-by:

From: @liu_xiao_93
Reviewed-by: 
Signed-off-by:

From: @Somnus2020
Reviewed-by: @zhoufeng54,@kingxian
Signed-off-by: @kingxian

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

From: @jiangzg001
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

From: @Somnus2020
Reviewed-by: @kingxian,@zh_qh
Signed-off-by: @kingxian

From: @lihongkang1
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

From: @lihongkang1
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

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