code: def setUp(self):
      self.x = numpy.random.uniform(-1, 1, (3, self.in_size)).astype(
          self.dtype
      )
      self.gy = numpy.random.uniform(-1, 1, (3, self.out_size)).astype(
          self.dtype
      )
  
      with chainer.using_config("dtype", self.dtype):
          self.mgu = links.StatefulMGU(self.in_size, self.out_size)
  
imports: import unittest
  import numpy
  import six
  import chainer
  from chainer.backends import cuda
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestStatefulMGU obj's underlying member method code with example usage: obj.setUp() without return types