code: def setUp(self):
      test_util.TensorFlowTestCase.setUp(self)
      self._rng = np.random.default_rng(42)
  
imports: import itertools
  from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import backprop
  from tensorflow.python.eager.def_function import function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the ApproxTopkTest obj's underlying member method code with example usage: obj.setUp() without return types