code: def __init__(self, n, batch_size, dims=[2], as_tensor=False):
      self.batch_size = batch_size
      self.dims = dims
      self.n = n
      self.as_tensor = as_tensor
      self.i = 0
  
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 1 to create a new TestIterator object  with example: obj = TestIterator(n, batch_size, dims, as_tensor)