code: def setUp(self):
      self._config_user = chainer.using_config("dtype", self.dtype)
      self._config_user.__enter__()
  
      x_shape = (self.batch_size, self.in_size)
      self.x = numpy.random.uniform(-1, 1, x_shape).astype(self.dtype)
      self.t = numpy.random.randint(
          len(self.count), size=self.batch_size
      ).astype(numpy.int32)
  
      self.link = links.BlackOut(
          self.in_size, self.count, self.n_samples
      )
      self.w = numpy.random.uniform(-1, 1, self.link.W.data.shape)
      self.link.W.data[:] = self.w
  
      if self.dtype == numpy.float16:
          self.check_forward_options = {"atol": 5e-3}
      else:
          self.check_forward_options = {"atol": 1e-4}
  
file_path: chainer/tests/chainer_tests/links_tests/loss_tests/test_black_out.py
imports: import unittest
  import numpy
  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 TestBlackOut obj's underlying member method code with example usage: obj.setUp() without return types