void InferOpAttributes(
    const OpDef& op_def,
    std::unordered_map<string, string>* inferred_input_attrs);

bool ArgIsList(const OpDef::ArgDef& arg);

bool HasOptionalAttrs(
    const ApiDef& api_def,
    const std::unordered_map<string, string>& inferred_input_attrs);

struct OpInfo {
  // graph_op_def: The OpDef used by the runtime, has the names that

    InferArgAttributes(arg, inferred_input_attrs);
  }
}

bool ArgIsList(const OpDef::ArgDef& arg) {
  return !arg.type_list_attr().empty() || !arg.number_attr().empty();
}

bool HasOptionalAttrs(
    const ApiDef& api_def,
    const std::unordered_map<string, string>& inferred_input_attrs) {
  for (int i = 0; i < api_def.attr_size(); ++i) {
    const auto& attr(api_def.attr(i));