code: def _validate_flags():
      """Returns True if flag values are valid or prints error and returns False."""
      if FLAGS.list_ports:
          print(
              "Input ports: '%s'"
              % ("', '".join(midi_hub.get_available_input_ports()))
          )
          print(
              "Ouput ports: '%s'"
              % ("', '".join(midi_hub.get_available_output_ports()))
          )
          return False
  
      if FLAGS.bundle_files is None:
          print("--bundle_files must be specified.")
          return False
  
      if (
          len(FLAGS.bundle_files.split(",")) > 1
          and FLAGS.generator_select_control_number is None
      ):
          tf.logging.warning(
              "You have specified multiple bundle files (generators), without "
              "setting `--generator_select_control_number`. You will only be able to "
              "use the first generator (%s).",
              FLAGS.bundle_files[0],
          )
  
      return True
  
imports: import functools
  import re
  import threading
  import time
  from magenta.interfaces.midi import midi_hub
  from magenta.interfaces.midi import midi_interaction
  from magenta.models.drums_rnn import drums_rnn_sequence_generator
  from magenta.models.melody_rnn import melody_rnn_sequence_generator
  from magenta.models.performance_rnn import performance_sequence_generator
  from magenta.models.pianoroll_rnn_nade import pianoroll_rnn_nade_sequence_generator
  from magenta.models.polyphony_rnn import polyphony_sequence_generator
  from magenta.models.shared import sequence_generator_bundle
  import six
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling a global function with example usage: _validate_flags() and returns: True, False, False