code: def setUp(self):
      if self.gru == links.StatelessGRU:
          if hasattr(self, "in_size"):
              self.link = self.gru(self.in_size, self.out_size)
          else:
              self.link = self.gru(None, self.out_size)
              self.in_size = self.out_size
      elif self.gru == links.StatefulGRU or self.gru == links.GRU:
          self.link = self.gru(self.in_size, self.out_size)
      else:
          self.fail(
              "Unsupported link(only GRU, StatelessGRU and "
              "StatefulGRU are supported):{}".format(self.gru)
          )
  
      self.x = numpy.random.uniform(-1, 1, (3, self.in_size)).astype(
          numpy.float32
      )
      if self.state == "random":
          self.h = numpy.random.uniform(
              -1, 1, (3, self.out_size)
          ).astype(numpy.float32)
      elif self.state == "zero":
          self.h = numpy.zeros((3, self.out_size), dtype=numpy.float32)
      else:
          self.fail(
              "Unsupported state initialization:{}".format(self.state)
          )
      self.gy = numpy.random.uniform(-1, 1, (3, self.out_size)).astype(
          numpy.float32
      )
  
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import cuda
  from chainer import gradient_check
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 1 for calling the TestGRU obj's underlying member method code with example usage: obj.setUp() without return types