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add net_design doc #2547

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add net_design doc #2547

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add net_design doc
Superjomn Jun 21, 2017
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net design in en
Superjomn Jun 21, 2017
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14 changes: 14 additions & 0 deletions doc/design/refactor_discuess/net_design.md
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# Overfiew

整体设计上参考 caffe2的SimpleNet，即Net 是一组 operator 的集合，包含了operator相关的操作，比如Create, RunOps, Delete 等。
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今天上午讨论的对外提供的接口包括：
AddOp
Run
这两个接口，
用户配置Net的接口为什么还需要Delete ？


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推荐design doc英文写 ，请参考目录下其他design doc，Interface 需要列出来，并简单描述一下
不应出现比如，设计文档是确定的方案，大家可以review和后续修改 : )

Net 有如下一些特性：

- Net 管理其拥有的operator
- Net 本身不占用任何Variable资源
- Net 的调用方式类似 Functor，即 `output = net(inputs, scope)` ，其中
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请确认一下，这里是显式调用Net.Run吧？

- scope提供net执行所需要的全局Variable
- 输入一个或多个variable, `inputs`
- 返回一个variable, `output`

# API