code: def _transform(self, a, b, c):
      self.count += 1
      if self.count % 2 == 0:
          mode = self.mode
      else:
          if self.mode is tuple:
              mode = dict
          elif self.mode is dict:
              mode = None
          elif self.mode is None:
              mode = tuple
  
      if mode is tuple:
          return (a,)
      elif mode is dict:
          return {"a": a}
      elif mode is None:
          return a
  
file_path: chainer/tests/chainer_tests/dataset_tests/tabular_tests/test_transform.py
imports: import unittest
  import numpy
  import six
  import chainer
  from chainer import testing
  from chainer_tests.dataset_tests.tabular_tests import dummy_dataset
label_desc: Use image node_id 2 for calling the TestTransformInvalid obj's underlying member method code with example usage: obj._transform(a, b, c) and returns: a, dict, a