code: def postprocess_tokens(self, task, target, hypo_tokens):
      tgt_tokens = (
          utils.strip_pad(target, task.tgt_dict.pad()).int().cpu()
      )
      tgt_str = task.tgt_dict.string(tgt_tokens, "sentencepiece")
      hypo_str = task.tgt_dict.string(hypo_tokens, "sentencepiece")
      return tgt_str, hypo_str
  
imports: from argparse import Namespace
  import os
  import re
  import unittest
  from pathlib import Path
  from tqdm import tqdm
  from typing import List, Dict, Optional
  import torch
  from fairseq.checkpoint_utils import load_model_ensemble_and_task
  from fairseq.scoring.wer import WerScorer
  from fairseq.scoring.bleu import SacrebleuScorer
  from fairseq import utils
  import zipfile
label_desc: Use image node_id 13 for calling the TestFairseqSpeech obj's underlying member method code with example usage: obj.postprocess_tokens(task, target, hypo_tokens) and returns: tgt_str,  hypo_str