From: @zyli2020
Reviewed-by: @cristoval,@limingqi107
Signed-off-by: @limingqi107

From: @cjh9368
Reviewed-by: 
Signed-off-by:

From: @simson_wu
Reviewed-by: @ginfung,@chujinjin
Signed-off-by: @chujinjin

From: @zhujingxuan
Reviewed-by: @hangangqiang,@wangchengyuan
Signed-off-by: @hangangqiang

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

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

From: @hangangqiang
Reviewed-by: @jpc_chenjianping,@zhanghaibo5
Signed-off-by: @zhanghaibo5

From: @ling_qiao_min
Reviewed-by: @zhanghaibo5,@hangangqiang
Signed-off-by: @zhanghaibo5

From: @zuochuanyong
Reviewed-by: @zhaizhiqiang,@guoqi1024
Signed-off-by: @guoqi1024

From: @liu_xiao_93
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

From: @anrui-wang
Reviewed-by: @wuxuejian,@liangchenghui
Signed-off-by: @wuxuejian

From: @zhujingxuan
Reviewed-by: @wangchengyuan,@hangangqiang
Signed-off-by: @wangchengyuan

From: @jiahongqian
Reviewed-by: @ljl0711,@wang_zi_dong
Signed-off-by: @wang_zi_dong

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

From: @zhaodezan
Reviewed-by: @jpc_chenjianping,@zhanghaibo5
Signed-off-by: @jpc_chenjianping

From: @VectorSL
Reviewed-by: @wilfchen,@limingqi107
Signed-off-by: @limingqi107

From: @yeyunpeng2020
Reviewed-by: @ddwsky,@zhanghaibo5
Signed-off-by: @ddwsky

From: @oacjiewen
Reviewed-by: @gemini524,@liangchenghui,@c_34
Signed-off-by: @liangchenghui,@c_34

From: @ouyang_xx
Reviewed-by: @oacjiewen,@c_34
Signed-off-by: @c_34

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

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: @hanhuifeng2020
Reviewed-by: @gaoxiong1,@dylangeng
Signed-off-by: @dylangeng