code: def build_collate_fn(
      cls, args: argparse.Namespace, train: bool
  ) -> Callable[
      [Collection[Tuple[str, Dict[str, np.ndarray]]]],
      Tuple[List[str], Dict[str, torch.Tensor]],
  ]:
      assert check_argument_types()
  
      return CommonCollateFn(float_pad_value=0.0, int_pad_value=0)
  
imports: import argparse
  from typing import Callable, Collection, Dict, List, Optional, Tuple
  import numpy
  import torch
  from typeguard import check_argument_types, check_return_type
  from espnet2.enh.espnet_model_tse import ESPnetExtractionModel
  from espnet2.enh.extractor.abs_extractor import AbsExtractor
  from espnet2.enh.extractor.td_speakerbeam_extractor import TDSpeakerBeamExtractor
  from espnet2.tasks.abs_task import AbsTask
  from espnet2.tasks.enh import criterion_choices, decoder_choices, encoder_choices, loss_wrapper_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, TSEPreprocessor
  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 int_or_none, str2bool, str_or_none
label_desc: Use image node_id 2 for calling the TargetSpeakerExtractionTask obj's underlying member method code with example usage: obj.build_collate_fn(cls, args, train) and returns: CommonCollateFn