code: def Bark(f):
      """returns the bark-scale value for input frequency f (in Hz)"""
      return 13 * np.arctan(0.00076 * f) + 3.5 * np.arctan(
          pow(f / 7500.0, 2)
      )
  
file_path: cleverhans/cleverhans_v3.1.0/examples/adversarial_asr/generate_masking_threshold.py
imports: import scipy.io.wavfile
  import numpy
  from scipy.fftpack import fft
  from scipy.fftpack import ifft
  from scipy import signal
  import scipy
  import librosa
label_desc: Use image node_id 2 for calling a global function with example usage: Bark(f) and returns: unknown