code: def test_init_from_config(self):
      config = VitsConfig(model_args=VitsArgs(num_chars=32))
      model = Vits.init_from_config(config, verbose=False).to(device)
  
      config = VitsConfig(
          model_args=VitsArgs(num_chars=32, num_speakers=2)
      )
      model = Vits.init_from_config(config, verbose=False).to(device)
      self.assertTrue(not hasattr(model, "emb_g"))
  
      config = VitsConfig(
          model_args=VitsArgs(
              num_chars=32, num_speakers=2, use_speaker_embedding=True
          )
      )
      model = Vits.init_from_config(config, verbose=False).to(device)
      self.assertEqual(model.num_speakers, 2)
      self.assertTrue(hasattr(model, "emb_g"))
  
      config = VitsConfig(
          model_args=VitsArgs(
              num_chars=32,
              num_speakers=2,
              use_speaker_embedding=True,
              speakers_file=os.path.join(
                  get_tests_data_path(), "ljspeech", "speakers.json"
              ),
          )
      )
      model = Vits.init_from_config(config, verbose=False).to(device)
      self.assertEqual(model.num_speakers, 10)
      self.assertTrue(hasattr(model, "emb_g"))
  
      config = VitsConfig(
          model_args=VitsArgs(
              num_chars=32,
              use_d_vector_file=True,
              d_vector_dim=256,
              d_vector_file=[
                  os.path.join(
                      get_tests_data_path(), "dummy_speakers.json"
                  )
              ],
          )
      )
      model = Vits.init_from_config(config, verbose=False).to(device)
      self.assertTrue(model.num_speakers == 1)
      self.assertTrue(not hasattr(model, "emb_g"))
      self.assertTrue(model.embedded_speaker_dim == config.d_vector_dim)
  
imports: import copy
  import os
  import unittest
  import torch
  from trainer.logging.tensorboard_logger import TensorboardLogger
  from tests import assertHasAttr, assertHasNotAttr, get_tests_data_path, get_tests_input_path, get_tests_output_path
  from TTS.config import load_config
  from TTS.encoder.utils.generic_utils import setup_encoder_model
  from TTS.tts.configs.vits_config import VitsConfig
  from TTS.tts.models.vits import Vits, VitsArgs, VitsAudioConfig, amp_to_db, db_to_amp, load_audio, spec_to_mel, wav_to_mel, wav_to_spec
  from TTS.tts.utils.speakers import SpeakerManager
label_desc: Use image node_id 28 for calling the TestVits obj's underlying member method code with example usage: obj.test_init_from_config() without return types