code: def test_convert_to_cpu(self, device):
      a = Tensor([[1, 2], [3, 4]], device=device)
      assert a.numpy().shape == (2, 2)
      b = a.cpu()
      assert b.numpy().shape == (2, 2)
  
file_path: tinygrad/test/external/external_test_example.py
imports: import unittest
  from tinygrad import Device
  from tinygrad.tensor import Tensor
  from tinygrad.helpers import getenv, CI
label_desc: Use image node_id 1 for calling the TestExample obj's underlying member method code with example usage: obj.test_convert_to_cpu(device) without return types