code: def __iter__(self):
      # return a copy, so that the iteration number doesn't collide
      return TestIteratorZeroCopy(
          self.n,
          self.batch_size,
          self.dims,
          self.as_tensor,
          self.num_keep_samples,
      )
  
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 TestIteratorZeroCopy obj's underlying member method code with example usage: obj.__iter__() and returns: TestIteratorZeroCopy