code: def loudness_normalize(sources_list, gain_list):
      """Normalize sources loudness"""
      # Create the list of normalized sources
      normalized_list = []
      for i, source in enumerate(sources_list):
          normalized_list.append(source * gain_list[i])
      return normalized_list
  
imports: import os
  import argparse
  import soundfile
  import pandas
  import numpy
  import functools
  from scipy.signal import resample_poly
  import tqdm.contrib.concurrent
  import glob
  import shutil
label_desc: Use image node_id 12 for calling a global function with example usage: loudness_normalize(sources_list, gain_list) and returns: normalized_list