code: def setUp(self):
      self._config_user = chainer.using_config("dtype", self.dtype)
      self._config_user.__enter__()
  
      self.x = utils.force_array(
          (numpy.random.random(self.shape) - 0.5) * 3, self.dtype
      )
      self.t = utils.force_array(
          (numpy.random.random(self.shape) - 0.5), self.dtype
      )
      if self.reduce == "sum_along_second_axis":
          gy_shape = self.shape[:1] + self.shape[2:]
      else:
          gy_shape = self.shape
      self.gy = utils.force_array(
          numpy.random.random(gy_shape), self.dtype
      )
      self.ggx = utils.force_array(
          numpy.random.uniform(-1, 1, self.x.shape), self.dtype
      )
      self.ggt = utils.force_array(
          numpy.random.uniform(-1, 1, self.t.shape), self.dtype
      )
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
  from chainer import utils
label_desc: Use image node_id 1 for calling the TestHuberLoss obj's underlying member method code with example usage: obj.setUp() without return types