code: def test_forth_and_back(self, device, dtype):  # skipcq: PYL-R0201
      data = (
          torch.rand(3, 4, 5, device=device, dtype=dtype)
          .repeat_interleave(2, dim=2)
          .repeat_interleave(2, dim=1)
      )
  
      yuv = kornia.color.rgb_to_yuv420
      rgb = kornia.color.yuv420_to_rgb
      (a, b) = yuv(data)
      data_out = rgb(a, b)
      self.assert_close(data_out, data, low_tolerance=True)
  
imports: import pytest
  import torch
  from torch.autograd import gradcheck
  import kornia
  from kornia.testing import BaseTester
label_desc: Use image node_id 9 for calling the TestRgbToYuv420 obj's underlying member method code with example usage: obj.test_forth_and_back(device, dtype) without return types