code: def testStackPushPop(self):
      self._testStackPushPop(use_gpu=False)
      self._testStackPushPop(use_gpu=True)
  
imports: import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import gen_data_flow_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import while_loop
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the StackOpTest obj's underlying member method code with example usage: obj.testStackPushPop() without return types