code: def test_unproject_and_project(self, device, dtype):
      point_2d = torch.tensor([[0.0, 0.0]], device=device, dtype=dtype)
      depth = torch.tensor([[2.0]], device=device, dtype=dtype)
      camera_matrix = torch.tensor(
          [[1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0]],
          device=device,
          dtype=dtype,
      )
      point_3d = kornia.geometry.camera.unproject_points(
          point_2d, depth, camera_matrix
      )
      point_2d_hat = kornia.geometry.camera.project_points(
          point_3d, camera_matrix
      )
      assert_close(point_2d, point_2d_hat, atol=1e-4, rtol=1e-4)
  
imports: import torch
  from torch.autograd import gradcheck
  import kornia
  from kornia.testing import assert_close, tensor_to_gradcheck_var
label_desc: Use image node_id 6 for calling the TestUnprojectPoints obj's underlying member method code with example usage: obj.test_unproject_and_project(device, dtype) without return types