// Get the number of operations that have `*oper` as a control input.
// Note that this number can change when new operations are added to
// the graph.
TF_CAPI_EXPORT extern int TF_OperationNumControlOutputs(TF_Operation* oper);

// Get the list of operations that have `*oper` as a control input.
// `control_outputs` must point to an array of length at least