code: def build_model(
      cls, args: argparse.Namespace
  ) -> Union[ESPnetSTModel]:
      assert check_argument_types()
      if isinstance(args.token_list, str):
          with open(args.token_list, encoding="utf-8") as f:
              token_list = [line.rstrip() for line in f]
  
          # Overwriting token_list to keep it as "portable".
          args.token_list = list(token_list)
      elif isinstance(args.token_list, (tuple, list)):
          token_list = list(args.token_list)
      else:
          raise RuntimeError("token_list must be str or list")
      vocab_size = len(token_list)
      logging.info(f"Vocabulary size: {vocab_size }")
  
      if args.src_token_list is not None:
          if isinstance(args.src_token_list, str):
              with open(args.src_token_list, encoding="utf-8") as f:
                  src_token_list = [line.rstrip() for line in f]
  
              # Overwriting src_token_list to keep it as "portable".
              args.src_token_list = list(src_token_list)
          elif isinstance(args.src_token_list, (tuple, list)):
              src_token_list = list(args.src_token_list)
          else:
              raise RuntimeError("token_list must be str or list")
          src_vocab_size = len(src_token_list)
          logging.info(f"Source vocabulary size: {src_vocab_size }")
      else:
          src_token_list, src_vocab_size = None, None
  
      # 1. frontend
      if args.input_size is None:
          # Extract features in the model
          frontend_class = frontend_choices.get_class(args.frontend)
          frontend = frontend_class(**args.frontend_conf)
          input_size = frontend.output_size()
      else:
          # Give features from data-loader
          args.frontend = None
          args.frontend_conf = {}
          frontend = None
          input_size = args.input_size
  
      # 2. Data augmentation for spectrogram
      if args.specaug is not None:
          specaug_class = specaug_choices.get_class(args.specaug)
          specaug = specaug_class(**args.specaug_conf)
      else:
          specaug = None
  
      # 3. Normalization layer
      if args.normalize is not None:
          normalize_class = normalize_choices.get_class(args.normalize)
          normalize = normalize_class(**args.normalize_conf)
      else:
          normalize = None
  
      # 4. Pre-encoder input block
      # NOTE(kan-bayashi): Use getattr to keep the compatibility
      if getattr(args, "preencoder", None) is not None:
          preencoder_class = preencoder_choices.get_class(
              args.preencoder
          )
          preencoder = preencoder_class(**args.preencoder_conf)
          input_size = preencoder.output_size()
      else:
          preencoder = None
  
      # 4. Encoder
      encoder_class = encoder_choices.get_class(args.encoder)
      encoder = encoder_class(
          input_size=input_size, **args.encoder_conf
      )
  
      asr_encoder_output_size = encoder.output_size()
      if getattr(args, "hier_encoder", None) is not None:
          hier_encoder_class = hier_encoder_choices.get_class(
              args.hier_encoder
          )
          hier_encoder = hier_encoder_class(
              input_size=asr_encoder_output_size,
              **args.hier_encoder_conf,
          )
          encoder_output_size = hier_encoder.output_size()
      else:
          hier_encoder = None
          encoder_output_size = asr_encoder_output_size
  
      # 5. Post-encoder block
      # NOTE(kan-bayashi): Use getattr to keep the compatibility
      if getattr(args, "postencoder", None) is not None:
          postencoder_class = postencoder_choices.get_class(
              args.postencoder
          )
          postencoder = postencoder_class(
              input_size=encoder_output_size, **args.postencoder_conf
          )
          encoder_output_size = postencoder.output_size()
      else:
          postencoder = None
  
      # 5. Decoder
      decoder_class = decoder_choices.get_class(args.decoder)
  
      if args.decoder == "transducer":
          decoder = decoder_class(
              vocab_size,
              embed_pad=0,
              **args.decoder_conf,
          )
  
          st_joint_network = JointNetwork(
              vocab_size,
              encoder_output_size,
              decoder.dunits,
              **args.st_joint_net_conf,
          )
      else:
          decoder = decoder_class(
              vocab_size=vocab_size,
              encoder_output_size=encoder_output_size,
              **args.decoder_conf,
          )
  
          st_joint_network = None
  
      # 6. CTC
      if src_token_list is not None:
          ctc = CTC(
              odim=src_vocab_size,
              encoder_output_size=asr_encoder_output_size,
              **args.ctc_conf,
          )
      else:
          ctc = None
  
      st_ctc = CTC(
          odim=vocab_size,
          encoder_output_size=encoder_output_size,
          **args.ctc_conf,
      )
  
      # 7. ASR extra decoder
      if (
          getattr(args, "extra_asr_decoder", None) is not None
          and src_token_list is not None
      ):
          extra_asr_decoder_class = extra_asr_decoder_choices.get_class(
              args.extra_asr_decoder
          )
          extra_asr_decoder = extra_asr_decoder_class(
              vocab_size=src_vocab_size,
              encoder_output_size=asr_encoder_output_size,
              **args.extra_asr_decoder_conf,
          )
      else:
          extra_asr_decoder = None
  
      # 8. MT extra decoder
      if getattr(args, "extra_mt_decoder", None) is not None:
          extra_mt_decoder_class = extra_mt_decoder_choices.get_class(
              args.extra_mt_decoder
          )
          extra_mt_decoder = extra_mt_decoder_class(
              vocab_size=vocab_size,
              encoder_output_size=encoder_output_size,
              **args.extra_mt_decoder_conf,
          )
      else:
          extra_mt_decoder = None
  
      # 9. MD encoder
      if getattr(args, "md_encoder", None) is not None:
          md_encoder_class = md_encoder_choices.get_class(
              args.md_encoder
          )
          md_encoder = md_encoder_class(
              input_size=extra_asr_decoder._output_size_bf_softmax,
              **args.md_encoder_conf,
          )
      else:
          md_encoder = None
  
      if getattr(args, "extra_mt_encoder", None) is not None:
          extra_mt_encoder_class = extra_mt_encoder_choices.get_class(
              args.extra_mt_encoder
          )
          extra_mt_encoder = extra_mt_encoder_class(
              input_size=vocab_size,  # hacked for mbart
              **args.extra_mt_encoder_conf,
          )
      else:
          extra_mt_encoder = None
  
      model = ESPnetSTModel(
          vocab_size=vocab_size,
          src_vocab_size=src_vocab_size,
          frontend=frontend,
          specaug=specaug,
          normalize=normalize,
          preencoder=preencoder,
          encoder=encoder,
          hier_encoder=hier_encoder,
          md_encoder=md_encoder,
          postencoder=postencoder,
          decoder=decoder,
          ctc=ctc,
          st_ctc=st_ctc,
          st_joint_network=st_joint_network,
          extra_asr_decoder=extra_asr_decoder,
          extra_mt_decoder=extra_mt_decoder,
          extra_mt_encoder=extra_mt_encoder,
          token_list=token_list,
          src_token_list=src_token_list,
          **args.model_conf,
      )
  
      # FIXME(kamo): Should be done in model?
      # 9. Initialize
      if args.init is not None:
          initialize(model, args.init)
  
      assert check_return_type(model)
      return model
  
imports: import argparse
  import logging
  from typing import Callable, Collection, Dict, List, Optional, Tuple, Union
  import numpy
  import torch
  from typeguard import check_argument_types, check_return_type
  from espnet2.asr.ctc import CTC
  from espnet2.asr.decoder.abs_decoder import AbsDecoder
  from espnet2.asr.decoder.hugging_face_transformers_decoder import HuggingFaceTransformersDecoder
  from espnet2.asr.decoder.rnn_decoder import RNNDecoder
  from espnet2.asr.decoder.transducer_decoder import TransducerDecoder
  from espnet2.asr.decoder.transformer_decoder import DynamicConvolution2DTransformerDecoder, DynamicConvolutionTransformerDecoder, LightweightConvolution2DTransformerDecoder, LightweightConvolutionTransformerDecoder, TransformerDecoder, TransformerMDDecoder
  from espnet2.asr.decoder.whisper_decoder import OpenAIWhisperDecoder
  from espnet2.asr.encoder.abs_encoder import AbsEncoder
  from espnet2.asr.encoder.branchformer_encoder import BranchformerEncoder
  from espnet2.asr.encoder.conformer_encoder import ConformerEncoder
  from espnet2.asr.encoder.contextual_block_conformer_encoder import ContextualBlockConformerEncoder
  from espnet2.asr.encoder.contextual_block_transformer_encoder import ContextualBlockTransformerEncoder
  from espnet2.asr.encoder.e_branchformer_encoder import EBranchformerEncoder
  from espnet2.asr.encoder.hubert_encoder import FairseqHubertEncoder, FairseqHubertPretrainEncoder
  from espnet2.asr.encoder.hugging_face_transformers_encoder import HuggingFaceTransformersEncoder
  from espnet2.asr.encoder.rnn_encoder import RNNEncoder
  from espnet2.asr.encoder.transformer_encoder import TransformerEncoder
  from espnet2.asr.encoder.vgg_rnn_encoder import VGGRNNEncoder
  from espnet2.asr.encoder.wav2vec2_encoder import FairSeqWav2Vec2Encoder
  from espnet2.asr.encoder.whisper_encoder import OpenAIWhisperEncoder
  from espnet2.asr.frontend.abs_frontend import AbsFrontend
  from espnet2.asr.frontend.default import DefaultFrontend
  from espnet2.asr.frontend.s3prl import S3prlFrontend
  from espnet2.asr.frontend.windowing import SlidingWindow
  from espnet2.asr.postencoder.abs_postencoder import AbsPostEncoder
  from espnet2.asr.postencoder.hugging_face_transformers_postencoder import HuggingFaceTransformersPostEncoder
  from espnet2.asr.postencoder.length_adaptor_postencoder import LengthAdaptorPostEncoder
  from espnet2.asr.preencoder.abs_preencoder import AbsPreEncoder
  from espnet2.asr.preencoder.linear import LinearProjection
  from espnet2.asr.preencoder.sinc import LightweightSincConvs
  from espnet2.asr.specaug.abs_specaug import AbsSpecAug
  from espnet2.asr.specaug.specaug import SpecAug
  from espnet2.asr_transducer.joint_network import JointNetwork
  from espnet2.layers.abs_normalize import AbsNormalize
  from espnet2.layers.global_mvn import GlobalMVN
  from espnet2.layers.utterance_mvn import UtteranceMVN
  from espnet2.st.espnet_model import ESPnetSTModel
  from espnet2.tasks.abs_task import AbsTask
  from espnet2.text.phoneme_tokenizer import g2p_choices
  from espnet2.torch_utils.initialize import initialize
  from espnet2.train.class_choices import ClassChoices
  from espnet2.train.collate_fn import CommonCollateFn
  from espnet2.train.preprocessor import AbsPreprocessor, MutliTokenizerCommonPreprocessor
  from espnet2.train.trainer import Trainer
  from espnet2.utils.get_default_kwargs import get_default_kwargs
  from espnet2.utils.nested_dict_action import NestedDictAction
  from espnet2.utils.types import float_or_none, int_or_none, str2bool, str_or_none
label_desc: Use image node_id 6 for calling the STTask obj's underlying member method code with example usage: obj.build_model(cls, args) and returns: model