code: def lang_token(lang):
      return f"<{lang}>"
  
imports: import logging
  import os
  from dataclasses import dataclass, field
  from typing import Optional
  import numpy
  import torch
  from omegaconf import II
  from fairseq import utils
  from fairseq.data import AppendTokenDataset, ConcatDataset, Dictionary, IdDataset, LMContextWindowDataset, MonolingualDataset, NestedDictionaryDataset, NumelDataset, PadDataset, PrependTokenDataset, ResamplingDataset, SortDataset, StripTokenDataset, TokenBlockDataset, TruncatedDictionary, data_utils
  from fairseq.data.indexed_dataset import get_available_dataset_impl
  from fairseq.data.shorten_dataset import maybe_shorten_dataset
  from fairseq.dataclass import ChoiceEnum, FairseqDataclass
  from fairseq.tasks import LegacyFairseqTask, register_task
label_desc: Use image node_id 1 for calling a global function with example usage: lang_token(lang) and returns: str, lang, str