code: def dynamic_range_decompression(x, C=1):
      return np.exp(x) / C
  
imports: import math
  import os
  import random
  import torch
  import torch.utils.data
  import numpy
  from librosa.util import normalize
  from scipy.io.wavfile import read
  from librosa.filters import mel
label_desc: Use image node_id 3 for calling a global function with example usage: dynamic_range_decompression(x, C) and returns: unknown