code: def setUpClass(cls):
      Device[Device.DEFAULT].synchronize()
  
file_path: tinygrad/test/test_copy_speed.py
imports: import unittest
  from tinygrad import Tensor
  from tinygrad import Device
  from tinygrad.helpers import Timing, CI, OSX
  import multiprocessing.shared_memory
label_desc: Use image node_id 1 for calling the TestCopySpeed obj's underlying member method code with example usage: obj.setUpClass(cls) without return types