code: def create_ref():
      ref = []
      for i in range(len(names)):
          wave = generate_waveforms(lengths[i], freqs[i])
          wave = (wave * 32767).round().astype(np.int16)
          ref.append(wave)
      return ref
  
imports: from nvidia.dali import Pipeline, pipeline_def
  from nvidia.dali import fn
  import nvidia.dali.types
  import scipy.io.wavfile
  import numpy
  import json
  import tempfile
  import os
  from test_audio_decoder_utils import generate_waveforms
  from test_utils import compare_pipelines
label_desc: Use image node_id 2 for calling a global function with example usage: create_ref() and returns: ref