code: def iter_setup(self):
      data = self.iterator.next()
      self.feed_input(self.data, data)
  
file_path: DALI/dali/test/python/operator_1/test_power_spectrum.py
imports: from nvidia.dali.pipeline import Pipeline
  import nvidia.dali.ops
  import numpy
  from functools import partial
  from test_utils import compare_pipelines
  from test_utils import RandomDataIterator
label_desc: Use image node_id 3 for calling the PowerSpectrumPipeline obj's underlying member method code with example usage: obj.iter_setup() without return types