---
Remove the routine of handling isolated nodes in Renormalize.
Add isolated nodes from Parser&Resolver.
Modify isolated nodes handling in FG&Manager.
Optimize the renormalize routines.
Other optimizations.

This bug make GetInputTensorNum() returns wrong number after communication_op_fusion.

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

From: @jojobugfree
Reviewed-by: 
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modified:   postprocess.py

From: @caojian05
Reviewed-by: @oacjiewen
Signed-off-by:

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

From: @lihongkang1
Reviewed-by: 
Signed-off-by:

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

From: @louie5
Reviewed-by: 
Signed-off-by:

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

From: @c_34
Reviewed-by: @wuxuejian
Signed-off-by: @wuxuejian

From: @zhoufeng54
Reviewed-by: 
Signed-off-by:

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

From: @xiefangqi
Reviewed-by: @liucunwei,@liucunwei,@heleiwang
Signed-off-by: @liucunwei

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

From: @jojobugfree
Reviewed-by: @chujinjin,@jjfeing
Signed-off-by: @chujinjin

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

From: @lizhenglong1992
Reviewed-by: @heleiwang,@liucunwei
Signed-off-by: @liucunwei

From: @dinglongwei
Reviewed-by: @liangchenghui,@c_34
Signed-off-by: @liangchenghui

From: @zhangxinfeng3
Reviewed-by: @ljl0711,@wang_zi_dong
Signed-off-by: @wang_zi_dong

From: @gaoyong10
Reviewed-by: 
Signed-off-by:

Signed-off-by: alex-yuyue <yue.yu1@huawei.com>

add tests

removed some unused imports

fix ci

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

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

add float64 support to scatterNd for GatherNd grad

fix typo

left out a file

From: @alexyuyue
Reviewed-by: @nsyca
Signed-off-by:

Fixed compile error

Fixed more testcases

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