code: def plot():
      def plot_spec(ax, spec, title):
          ax.set_title(title)
          ax.imshow(
              librosa.amplitude_to_db(spec),
              origin="lower",
              aspect="auto",
          )
  
      fig, axes = plt.subplots(3, 1, sharex=True, sharey=True)
      plot_spec(axes[0], torch.abs(spec_12[0]), title="Stretched x1.2")
      plot_spec(axes[1], torch.abs(spec[0]), title="Original")
      plot_spec(axes[2], torch.abs(spec_09[0]), title="Stretched x0.9")
      fig.tight_layout()
  
file_path: audio/examples/tutorials/audio_feature_augmentation_tutorial.py
imports: import torch
  import torchaudio
  import torchaudio.transforms
  import librosa
  import matplotlib.pyplot
  from IPython.display import Audio
  from torchaudio.utils import download_asset
label_desc: Use image node_id 4 for calling a global function with example usage: plot() without return types