code: def _create_random_model(self):
      # pylint: disable=global-statement
      global symbols, phonemes
      config = load_config(
          os.path.join(
              get_tests_output_path(), "dummy_model_config.json"
          )
      )
      if "characters" in config.keys():
          symbols, phonemes = make_symbols(**config.characters)
  
      num_chars = len(phonemes) if config.use_phonemes else len(symbols)
      model = setup_model(num_chars, 0, config)
      output_path = os.path.join(get_tests_output_path())
      save_checkpoint(model, None, 10, 10, 1, output_path)
  
file_path: TTS/tests/test_demo_server.py
imports: import os
  import unittest
  from tests import get_tests_input_path, get_tests_output_path
  from TTS.utils.synthesizer import Synthesizer
  from TTS.tts.utils.generic_utils import setup_model
  from TTS.tts.utils.io import save_checkpoint
  from TTS.tts.utils.text.symbols import make_symbols, phonemes, symbols
  from TTS.utils.io import load_config
label_desc: Use image node_id 1 for calling the DemoServerTest obj's underlying member method code with example usage: obj._create_random_model() without return types