code: def get_parallel_corpus_for_lang_pair(
      parallel_corpora: List[str], lang_pair: str
  ) -> Tuple[str, str]:
      """
      Fetches parallel corpus that belong to given lang_pair
      parallel_corpora: List[str] where each element is a str with the format
      "src_lang-tgt_lang:src_corpus,tgt_corpus"
  
      Returns None if parallel corpora for lang_pair is not found
      """
      for parallel_corpus_config in parallel_corpora:
          (
              corpus_lang_pair,
              parallel_corpus,
          ) = parallel_corpus_config.split(":")
          if corpus_lang_pair == lang_pair:
              return tuple(parallel_corpus.split(","))
      return None
  
file_path: translate/pytorch_translate/multilingual_utils.py
imports: import argparse
  import os
  from collections import defaultdict
  from typing import Dict, List, Optional, Tuple
  from pytorch_translate.data import dictionary
label_desc: Use image node_id 6 for calling a global function with example usage: get_parallel_corpus_for_lang_pair(parallel_corpora, lang_pair) and returns: None, tuple