code: def setUp(self):
      self.data = [
          (u, i, random.randint(1, 5), random.randint(0, 100))
          for (u, i) in itertools.product(
              ["u1", "u2", "u3", "u4", "u5", "u6"],
              ["i1", "i2", "i3", "i4", "i5", "i6"],
          )
      ]
  
file_path: cornac/tests/cornac/eval_methods/test_stratified_split.py
imports: import unittest
  import itertools
  import random
  from math import isclose
  from cornac.eval_methods import StratifiedSplit
  from cornac.data import Reader
  from cornac.models import MF
  from cornac.metrics import MAE, Recall
label_desc: Use image node_id 1 for calling the TestStratifiedSplit obj's underlying member method code with example usage: obj.setUp() without return types