code: def square_wave(frequency):
      """Emit a square wave at the given frequency."""
      # The square is just the sign of the sine!
      return tf.sign(sine_wave(frequency))
  
file_path: tensorboard/tensorboard/plugins/audio/audio_demo.py
imports: import inspect
  import math
  import os.path
  from absl import app
  from absl import flags
  import tensorflow
label_desc: Use image node_id 4 for calling a global function with example usage: square_wave(frequency) and returns: tf