code: def test_init_multispeaker(self):
      config = GlowTTSConfig(num_chars=32)
      model = GlowTTS(config)
      # speaker embedding with default speaker_embedding_dim
      config.use_speaker_embedding = True
      config.num_speakers = 5
      config.d_vector_dim = None
      model.init_multispeaker(config)
      self.assertEqual(model.c_in_channels, model.hidden_channels_enc)
      # use external speaker embeddings with speaker_embedding_dim = 301
      config = GlowTTSConfig(num_chars=32)
      config.use_d_vector_file = True
      config.d_vector_dim = 301
      model = GlowTTS(config)
      model.init_multispeaker(config)
      self.assertEqual(model.c_in_channels, 301)
      # use speaker embedddings by the provided speaker_manager
      config = GlowTTSConfig(num_chars=32)
      config.use_speaker_embedding = True
      config.speakers_file = os.path.join(
          get_tests_data_path(), "ljspeech", "speakers.json"
      )
      speaker_manager = SpeakerManager.init_from_config(config)
      model = GlowTTS(config)
      model.speaker_manager = speaker_manager
      model.init_multispeaker(config)
      self.assertEqual(model.c_in_channels, model.hidden_channels_enc)
      self.assertEqual(model.num_speakers, speaker_manager.num_speakers)
      # use external speaker embeddings by the provided speaker_manager
      config = GlowTTSConfig(num_chars=32)
      config.use_d_vector_file = True
      config.d_vector_dim = 256
      config.d_vector_file = os.path.join(
          get_tests_data_path(), "dummy_speakers.json"
      )
      speaker_manager = SpeakerManager.init_from_config(config)
      model = GlowTTS(config)
      model.speaker_manager = speaker_manager
      model.init_multispeaker(config)
      self.assertEqual(
          model.c_in_channels, speaker_manager.embedding_dim
      )
      self.assertEqual(model.num_speakers, speaker_manager.num_speakers)
  
imports: import copy
  import os
  import unittest
  import torch
  from torch import optim
  from trainer.logging.tensorboard_logger import TensorboardLogger
  from tests import get_tests_data_path, get_tests_input_path, get_tests_output_path
  from TTS.tts.configs.glow_tts_config import GlowTTSConfig
  from TTS.tts.layers.losses import GlowTTSLoss
  from TTS.tts.models.glow_tts import GlowTTS
  from TTS.tts.utils.speakers import SpeakerManager
  from TTS.utils.audio import AudioProcessor
label_desc: Use image node_id 3 for calling the TestGlowTTS obj's underlying member method code with example usage: obj.test_init_multispeaker() without return types