code: def setUp(self):
      if not hasattr(self, "no_visible"):
          self.no_visible = False
  
imports: import numpy
  import unittest
  from chainer.dataset import DatasetMixin
  from chainercv.utils import assert_is_point_dataset
  from chainercv.utils import testing
label_desc: Use image node_id 1 for calling the TestAssertIsPointDataset obj's underlying member method code with example usage: obj.setUp() without return types