code: def test_smoke(self, device, dtype):
      H, W = 4, 6
      imgy = torch.rand(1, H, W, device=device, dtype=dtype)
      imguv = torch.rand(
          2, int(H / 2), int(W / 2), device=device, dtype=dtype
      )
      assert isinstance(
          kornia.color.yuv420_to_rgb(imgy, imguv), torch.Tensor
      )
  
imports: import pytest
  import torch
  from torch.autograd import gradcheck
  import kornia
  from kornia.testing import BaseTester
label_desc: Use image node_id 1 for calling the TestYuv420ToRgb obj's underlying member method code with example usage: obj.test_smoke(device, dtype) without return types