code: def setUp(self):
      self.iteratorA = ["1", "2", "3", "4", "5"]
      self.iteratorB = ["a", "b", "c"]
      self.iter_dict = {"A": self.iteratorA, "B": self.iteratorB}
  
      self.iteratorC = ["d", "e", "f"]
      self.iteratorD = ["6", "7", "8", "9", "10"]
      self.alternating_iter_dict = {
          "A": self.iteratorA,
          "B": self.iteratorB,
          "C": self.iteratorC,
          "D": self.iteratorD,
      }
  
file_path: pytext/pytext/data/test/batch_sampler_test.py
imports: import unittest
  from pytext.data import AlternatingRandomizedBatchSampler, EvalBatchSampler, RandomizedBatchSampler, RoundRobinBatchSampler
label_desc: Use image node_id 1 for calling the BatchSamplerTest obj's underlying member method code with example usage: obj.setUp() without return types