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From: @peilin-wang
Reviewed-by: @robingrosman,@tom__chen
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1. description of num_shard in datasets.py
2. add param validation for sampler
3. add description for add_child in sampler.py

fix c++ ut compilation failed of Asan bug

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From: @jonwe
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增加测试用例

修改测试用例

修改测试用例

修改算子实现，alpha 写死为 1.0

修改算子实现，alpha 写死为 1
修改算子注册

修改算子实现，dy 和 y 搞反了

修改测试代码

修改算子实现

修改算子实现，float16 单独走一个分支

修改算子实现，前端的 float 转换为double

修改算子实现，改回来了

修改算子实现，float16 转换为 Eigen 库中的 half

修改算子实现，float16 转换为 Eigen 库中的 half

修改算子实现，float16 转换为 Eigen 库中的 half

修改算子实现 在单独的文件中实现 EluGrad

修改算子实现 在单独的文件中实现 EluGrad

修改算子实现 在单独的文件中实现 EluGrad

修改算子实现 在单独的文件中实现 EluGrad

格式化代码

修改 pylint 错误

更新注释信息

删除未使用的私有变量

删除未使用的私有变量

Fix can not collect input data when batch size is 1 and total step
number is 1

Fixed spelling errors