tensorflow - TensorFlow GraphDef 输入名称中的 '^' 前缀是什么意思？

Question

一些 TensorFlow 保存的模型在输入名称前包含一个 '^'。这些名字有特定的含义吗？它们与常规输入有何不同？例如:

node {
  name: "init"
  op: "NoOp"
  input: "^Variable/Assign"
  input: "^Variable_1/Assign"
}

Answer 1

这意味着控制输入，即手动添加依赖操作(more on this here)。来自NodeDef protobuf 消息文档:

Each input is "node:src_output" with "node" being a string name and "src_output" indicating which output tensor to use from "node". If "src_output" is 0 the ":0" suffix can be omitted. Regular inputs may optionally be followed by control inputs that have the format "^node".