code: def setUp(self):
      self.trainer = mock.MagicMock()
      self.trainer.out = tempfile.mkdtemp()
  
      self.link = _RandomDetectionStubLink()
      self.dataset = TupleDataset(
          np.random.uniform(size=(10, 3, 32, 48)),
          np.random.uniform(size=(10, 5, 4)),
          np.random.randint(0, 19, size=(10, 5)),
      )
      self.iterator = SerialIterator(
          self.dataset, 10, repeat=False, shuffle=False
      )
  
imports: import mock
  import numpy
  import os
  import six
  import tempfile
  import unittest
  import chainer
  from chainer.datasets import TupleDataset
  from chainer.iterators import SerialIterator
  from chainer.testing import attr
  from chainercv.extensions import DetectionVisReport
  from chainercv.utils import generate_random_bbox
  from chainercv.utils import testing
label_desc: Use image node_id 1 for calling the TestDetectionVisReport obj's underlying member method code with example usage: obj.setUp() without return types