tensorflow-core-framework-graph_to_functiondef.h

```cpp
#ifndef TENSORFLOW_CORE_FRAMEWORK_GRAPH_TO_FUNCTIONDEF_H_
#define TENSORFLOW_CORE_FRAMEWORK_GRAPH_TO_FUNCTIONDEF_H_

#include "absl/types/optional.h"
#include "tensorflow/core/framework/function.h"
#include "tensorflow/core/graph/graph.h"
#include "tensorflow/core/lib/core/status.h"

namespace tensorflow {

// Converts 'graph' to a FunctionDef 'fdef', with name 'name':
//
// (1) 'node->IsArg()' nodes converted to function inputs.
// (2) 'node->IsRetval()' nodes converted to function output.
// (3) 'control_ret' returns an optional with a control output name, that will
//     be added to the function `control_ret` map (see FunctionDef) and
//     `control_output` in Op definition (see OpDef). Control output name must
//     be unique for all control output nodes.
//
// Closely modeled on the Python code in tensorflow/python/framework/function.py
Status GraphToFunctionDef(
    const Graph& graph, const string& name,
    const std::function<absl::optional<string>(const Node*)>& control_ret,
    FunctionDef* fdef);

Status GraphToFunctionDef(const Graph& graph, const string& name,
                          FunctionDef* fdef);

}  // namespace tensorflow

#endif  // TENSORFLOW_CORE_FRAMEWORK_GRAPH_TO_FUNCTIONDEF_H_
```

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