From: @laiyongqiang
Reviewed-by: @kisnwang,@jjfeing
Signed-off-by: @jjfeing

add single element string tensor support for plugin tensor

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

From: @cathwong
Reviewed-by: @pandoublefeng,@tom__chen
Signed-off-by: @pandoublefeng

From: @lixiachen
Reviewed-by: @pandoublefeng,@robingrosman
Signed-off-by: @robingrosman

From: @huangbo77
Reviewed-by: @wuxuejian,@oacjiewen
Signed-off-by: @wuxuejian

From: @TFbunny
Reviewed-by: @robingrosman,@tom__chen
Signed-off-by: @robingrosman

From: @jachua
Reviewed-by: @guoqi1024,@liangchenghui
Signed-off-by: @liangchenghui

From: @yuanwei66
Reviewed-by: @wuxuejian,@c_34
Signed-off-by: @wuxuejian,@c_34

From: @jachua
Reviewed-by: @c_34,@guoqi1024
Signed-off-by: @c_34,@guoqi1024

From: @TFbunny
Reviewed-by: @tom__chen,@robingrosman
Signed-off-by: @robingrosman

From: @TFbunny
Reviewed-by: @tom__chen,@robingrosman
Signed-off-by: @robingrosman

From: @hfarahat
Reviewed-by: @pandoublefeng,@robingrosman
Signed-off-by: @pandoublefeng

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

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

From: @he-botao
Reviewed-by: @wuxuejian,@liangchenghui
Signed-off-by:

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

From: @yuanwei66
Reviewed-by: 
Signed-off-by:

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

From: @lizhenglong1992
Reviewed-by: 
Signed-off-by:

Signed-off-by: zhupuxu <zhupuxu@huawei.com>

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

Add L2NormalizeGradCPUKernel 修改测试用例误差判断方式

Add L2NormalizeGradCPUKernel 注释调试信息

Add L2NormalizeGradCPUKernel 修改反向算子的计算公式

Add L2NormalizeGradCPUKernel 去掉 float16 的注册

Add L2NormalizeGradCPUKernel 使用相对误差

Add L2NormalizeGradCPUKernel 更新反向公式

Add L2NormalizeGradCPUKernel 删除调试信息

清除告警

Add L2NormalizeGradCPUKernel 添加测试用例

Add L2NormalizeGradCPUKernel 删除多余的函数

Add L2NormalizeGradCPUKernel 修改注释中的时间

Add L2NormalizeGradCPUKernel 格式化代码

Add L2NormalizeGradCPUKernel 格式化代码，修改 cpplint 问题

Add L2NormalizeGradCPUKernel 修改 cpplint，pylint 问题

Add L2NormalizeGradCPUKernel 修改求导函数，与 GPU 和 Ascend 保持一致。
修改后的公式在数学意义上有问题，但已经和武雪剑对齐，认为没有影响，没有必要要求 GPU 和 Ascend 修改代码。

Add L2NormalizeGradCPUKernel 精简测试用例

From: @woshixiaoli
Reviewed-by: @liangchenghui,@chujinjin
Signed-off-by: @liangchenghui

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

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

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

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

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