code: def plot_fbank(fbank, title=None):
      fig, axs = plt.subplots(1, 1)
      axs.set_title(title or "Filter bank")
      axs.imshow(fbank, aspect="auto")
      axs.set_ylabel("frequency bin")
      axs.set_xlabel("mel bin")
  
file_path: audio/examples/tutorials/audio_feature_extractions_tutorial.py
imports: import torch
  import torchaudio
  import torchaudio.functional
  import torchaudio.transforms
  import librosa
  import matplotlib.pyplot
  from IPython.display import Audio
  from matplotlib.patches import Rectangle
  from torchaudio.utils import download_asset
label_desc: Use image node_id 3 for calling a global function with example usage: plot_fbank(fbank, title) without return types