int index;  // The index of the output within oper.
} TF_Output;

// TF_Function is a grouping of operations with defined inputs and outputs.
// Once created and added to graphs, functions can be invoked by creating an
// operation whose operation type matches the function name.
typedef struct TF_Function TF_Function;

// Function definition options. TODO(iga): Define and implement

/// assume that before any function using path arguments is invoked, the path is
/// made canonical by calling the function provided by `translate_name` or a
/// default implementation of that (supplied by core TensorFlow).
///
/// The only time the pointer to the `TF_*` structures from section 1 is not
/// marked `const` in these functions is when these function are either