code: def iter_setup(self):
      data = self.iterator.next()
      self.feed_input(self.data, data)
  
imports: from nvidia.dali.pipeline import Pipeline
  import nvidia.dali.ops
  import nvidia.dali.types
  import nvidia.dali
  import numpy
  from functools import partial
  from test_utils import get_files
  from test_utils import compare_pipelines
  from test_utils import RandomDataIterator
  from test_utils import ConstantDataIterator
  import librosa
  import math
label_desc: Use image node_id 3 for calling the SpectrogramPythonPipeline obj's underlying member method code with example usage: obj.iter_setup() without return types