code: def setUp(self):
      super(VisualizationTest, self).setUp()
      self.data_dir = get_data_dir()
  
file_path: tensor2tensor/tensor2tensor/visualization/visualization_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from tensor2tensor.utils import trainer_lib
  from tensor2tensor.visualization import visualization
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling the VisualizationTest obj's underlying member method code with example usage: obj.setUp() without return types