}  // namespace

FakeSession::FakeSession() {
  // We don't initialize devices in constructor as it causes some
  // global initialization fiasco between tests and code in TF.
}

void FakeSession::Initialize() {
  if (initialized_) return;
  BuildDeviceManager();
  InitVariables();
  initialized_ = true;
}

void FakeSession::BuildDeviceManager() {
  auto device =