}
    if (TF_GetCode(status) != TF_OK) return result;
  }
  result.emplace(std::move(per_device_outputs));
  return result;
}

std::vector<std::string> ParallelDevice::SummarizeDeviceNames() const {
  std::vector<DeviceNameUtils::ParsedName> parsed_components(
      underlying_devices_.size());
  for (int component_index = 0; component_index < underlying_devices_.size();
       ++component_index) {

  // Device strings for component devices that only include a
  // worker/task/replica if any of those differ across components. Useful for
  // printing debug messages.
  std::vector<std::string> SummarizeDeviceNames() const;

 private:
  // A sequence of device names, indicating which devices replicated operations
  // are forwarded to.
  const std::vector<std::string> underlying_devices_;