code: def main(unused_argv):
      if not FLAGS.input_dir:
          tf.logging.fatal("--input_dir required")
          return
  
      input_dir = os.path.expanduser(FLAGS.input_dir)
  
      CompareDirectory().compare_directory(input_dir)
  
file_path: magenta/magenta/scripts/abc_compare.py
imports: import os
  import pdb
  import re
  from note_seq import abc_parser
  from note_seq import midi_io
  from note_seq import sequences_lib
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling a global function with example usage: main(unused_argv) without return types