code: def setUp(self):
      self.x = [["a"], ["aa", "ab"], ["AA", "ab", "ac"]]
      self.y = [["O"], ["B-A", "I-A"], ["O", "O", "B-A"]]
  
imports: import os
  import shutil
  import unittest
  import numpy
  from anago.preprocessing import IndexTransformer, pad_nested_sequences
label_desc: Use image node_id 1 for calling the TestIndexTransformer obj's underlying member method code with example usage: obj.setUp() without return types