code: def test_callstack1():
      with pytest.raises(ValueError) as excinfo:
          C.device.gpu(99999)
      assert "[CALL STACK]" in str(excinfo.value)
  
imports: import numpy
  import pytest
  import cntk
  from multiprocessing import Process, Queue
label_desc: Use image node_id 3 for calling a global function with example usage: test_callstack1() without return types