code: def test_unit_white(self, device, dtype):  # skipcq: PYL-R0201
      refrgb = torch.tensor(
          [
              [[255, 255], [255, 255]],
              [[255, 255], [255, 255]],
              [[255, 255], [255, 255]],
          ],
          device=device,
          dtype=torch.uint8,
      )
      y = (
          torch.tensor(
              [[[255, 255], [255, 255]]],
              device=device,
              dtype=torch.uint8,
          ).type(dtype)
          / 255.0
      )
      uv = (
          torch.tensor(
              [[[0]], [[0]]], device=device, dtype=torch.int8
          ).type(torch.float)
          / 255.0
      )
  
      resrgb = (
          (kornia.color.yuv420_to_rgb(y, uv) * 255.0)
          .round()
          .type(torch.uint8)
      )
      self.assert_close(refrgb, resrgb)
  
imports: import pytest
  import torch
  from torch.autograd import gradcheck
  import kornia
  from kornia.testing import BaseTester
label_desc: Use image node_id 4 for calling the TestYuv420ToRgb obj's underlying member method code with example usage: obj.test_unit_white(device, dtype) without return types