code: def setUp(self):
      self.x = numpy.random.rand(3, 4)
      self.y = numpy.random.rand(3, 5)
      self.z = numpy.random.rand(4, 4)
  
file_path: chainer/tests/chainer_tests/datasets_tests/test_dict_dataset.py
imports: import unittest
  import numpy
  from chainer.backends import cuda
  from chainer import datasets
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestDictDataset obj's underlying member method code with example usage: obj.setUp() without return types