code: def setUp(self):
      self.x = numpy.random.uniform(-1, 1, (3, 2, 4)).astype(self.dtype)
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_sum.py
imports: import unittest
  import numpy
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestSumError obj's underlying member method code with example usage: obj.setUp() without return types