code: def normalize(S, hparams):
      return (S - hparams["min_level_db"]) / -hparams["min_level_db"]
  
file_path: PaddleHub/modules/audio/svs/diffsinger/utils/audio.py
imports: import subprocess
  import matplotlib
  import librosa
  import librosa.filters
  import numpy
  from scipy import signal
  from scipy.io import wavfile
label_desc: Use image node_id 7 for calling a global function with example usage: normalize(S, hparams) and returns: unknown