TF_DeviceList* devices = TFE_ContextListDevices(ctx, status.get());
  CHECK_EQ(TF_OK, TF_GetCode(status.get())) << TF_Message(status.get());

  const int num_devices = TF_DeviceListCount(devices);
  for (int i = 0; i < num_devices; ++i) {
    const string dev_type(TF_DeviceListType(devices, i, status.get()));
    CHECK_EQ(TF_GetCode(status.get()), TF_OK) << TF_Message(status.get());

    return signalPassFailure();

  // If there is no runtime device information and data format is not explicitly
  // forced, there is nothing to do.
  if (devices.NumDevices() == 0 && force_data_format_.empty()) return;

  func.walk([&](LayoutSensitiveInterface layout_sensitive_interface) {
    // Get desired op data format.
    StringRef target_data_format = force_data_format_;