code: def pre_segment(
      self,
      xs_pad: torch.Tensor,
      padding_mask: torch.Tensor,
  ) -> torch.Tensor:
      assert check_argument_types()
      return xs_pad, padding_mask
  
file_path: espnet/espnet2/uasr/segmenter/join_segmenter.py
imports: import argparse
  from typing import Dict, Optional
  import torch
  from typeguard import check_argument_types
  from espnet2.uasr.segmenter.abs_segmenter import AbsSegmenter
  from espnet2.utils.types import str2bool
label_desc: Use image node_id 2 for calling the JoinSegmenter obj's underlying member method code with example usage: obj.pre_segment(xs_pad, padding_mask) and returns: xs_pad,  padding_mask