code: def __iter__(self):
      # return a copy, so that the iteration number doesn't collide
      return TestIterator(
          self.n, self.batch_size, self.dims, self.as_tensor
      )
  
imports: import functools
  import numpy
  import nvidia.dali.fn
  import nvidia.dali.ops
  from nvidia.dali import Pipeline
  from nose_utils import assert_raises
  from test_utils import check_output
label_desc: Use image node_id 3 for calling the TestIterator obj's underlying member method code with example usage: obj.__iter__() and returns: TestIterator