code: def setUp(self):
      def transform(in_data):
          if isinstance(in_data, tuple):
              return tuple([example * 3 for example in in_data])
          else:
              return in_data * 3
  
      self.transform = transform
  
file_path: chainer/tests/chainer_tests/datasets_tests/test_transform_dataset.py
imports: import unittest
  import numpy
  from chainer import datasets
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestTransformDataset obj's underlying member method code with example usage: obj.setUp() and returns: tuple, unknown