code: def setUp(self):
      super(HotflipTest, self).setUp()
      self.hotflip = hotflip.HotFlip()
  
imports: from typing import Optional
  from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.api import dataset
  from lit_nlp.api import model
  from lit_nlp.api import types
  from lit_nlp.components import hotflip
  from lit_nlp.lib import utils
  import numpy
label_desc: Use image node_id 1 for calling the HotflipTest obj's underlying member method code with example usage: obj.setUp() without return types