class_docstr: A mapping from symbols to consecutive integers
code: def _get_meta(self):
      return [], []
  
imports: import os
  from collections import Counter
  from multiprocessing import Pool
  import torch
  from fairseq import utils
  from fairseq.data import data_utils
  from fairseq.file_chunker_utils import Chunker, find_offsets
  from fairseq.file_io import PathManager
  from fairseq.tokenizer import tokenize_line
label_desc: Use image node_id 21 for calling the Dictionary obj's underlying member method code with example usage: obj._get_meta() and returns: list,  list