code: def smoke_test(self, device, dtype):
      f = kornia.geometry.transform.Hflip()
      repr = "Hflip()"
      assert str(f) == repr
  
imports: import pytest
  import torch
  from torch.autograd import gradcheck
  import kornia
  import kornia.testing
  from kornia.testing import assert_close
label_desc: Use image node_id 1 for calling the TestHflip obj's underlying member method code with example usage: obj.smoke_test(device, dtype) without return types