docstr: initialize with the necessary elements
docstr_tok: ["initialize","with","the","necessary","elements"]
code: def _initialize(self):
      """
      initialize with the necessary elements
      """
      self.tts_checkpoint_path = os.path.join(
          self.directory, "assets", "tts", "step-162000"
      )
      self.waveflow_checkpoint_path = os.path.join(
          self.directory, "assets", "vocoder", "step-2000000"
      )
      self.waveflow_config_path = os.path.join(
          self.directory, "assets", "vocoder", "waveflow_ljspeech.yaml"
      )
  
      tts_config_path = os.path.join(
          self.directory, "assets", "tts", "ljspeech.yaml"
      )
      with open(tts_config_path) as f:
          self.tts_config = yaml.load(f, Loader=yaml.Loader)
      with fluid.dygraph.guard(fluid.CPUPlace()):
          self.tts_model = FastSpeechModel(
              self.tts_config["network"],
              num_mels=self.tts_config["audio"]["num_mels"],
          )
          io.load_parameters(
              model=self.tts_model,
              checkpoint_path=self.tts_checkpoint_path,
          )
  
          # Build vocoder.
          args = AttrDict()
          args.config = self.waveflow_config_path
          args.use_fp16 = False
          self.waveflow_config = io.add_yaml_config_to_args(args)
          self.waveflow = WaveFlowModule(self.waveflow_config)
          io.load_parameters(
              model=self.waveflow,
              checkpoint_path=self.waveflow_checkpoint_path,
          )
  
imports: import os
  import ast
  import argparse
  import importlib.util
  import nltk
  import paddle.fluid
  import paddle.fluid.dygraph
  import paddlehub
  from paddlehub.module.module import runnable
  from paddlehub.common.utils import mkdir
  from paddlehub.module.nlp_module import DataFormatError
  from paddlehub.common.logger import logger
  from paddlehub.module.module import moduleinfo, serving
  from paddlehub.common.dir import THIRD_PARTY_HOME
  from paddlehub.common.downloader import default_downloader
label_desc: Use image node_id 1 for calling the FastSpeech obj's underlying member method code with example usage: obj._initialize() without return types