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()
      # NOTE(kamo): int value = 0 is reserved by CTC-blank symbol
      return CommonCollateFn(
          float_pad_value=0.0, int_pad_value=args.int_pad_value
      )
  
imports: import argparse
  import logging
  from typing import Callable, Collection, Dict, List, Optional, Tuple
  import numpy
  import torch
  from typeguard import check_argument_types, check_return_type
  from espnet2.asr.frontend.abs_frontend import AbsFrontend
  from espnet2.asr.frontend.default import DefaultFrontend
  from espnet2.asr.frontend.fused import FusedFrontends
  from espnet2.asr.frontend.s3prl import S3prlFrontend
  from espnet2.asr.frontend.windowing import SlidingWindow
  from espnet2.tasks.abs_task import AbsTask, optim_classes
  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 CommonPreprocessor
  from espnet2.train.uasr_trainer import UASRTrainer
  from espnet2.uasr.discriminator.abs_discriminator import AbsDiscriminator
  from espnet2.uasr.discriminator.conv_discriminator import ConvDiscriminator
  from espnet2.uasr.espnet_model import ESPnetUASRModel
  from espnet2.uasr.generator.abs_generator import AbsGenerator
  from espnet2.uasr.generator.conv_generator import ConvGenerator
  from espnet2.uasr.loss.abs_loss import AbsUASRLoss
  from espnet2.uasr.loss.discriminator_loss import UASRDiscriminatorLoss
  from espnet2.uasr.loss.gradient_penalty import UASRGradientPenalty
  from espnet2.uasr.loss.phoneme_diversity_loss import UASRPhonemeDiversityLoss
  from espnet2.uasr.loss.pseudo_label_loss import UASRPseudoLabelLoss
  from espnet2.uasr.loss.smoothness_penalty import UASRSmoothnessPenalty
  from espnet2.uasr.segmenter.abs_segmenter import AbsSegmenter
  from espnet2.uasr.segmenter.join_segmenter import JoinSegmenter
  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 UASRTask obj's underlying member method code with example usage: obj.build_collate_fn(cls, args, train) and returns: CommonCollateFn