class_docstr: Abstract BPE Helper.
  
  BPE Helper subclasses must implement appropriate abstractmethods.
class_docstr_tok: ["Abstract","BPE","Helper",".","BPE","Helper","subclasses","must","implement","appropriate","abstractmethods","."]
docstr: Build the codecs.
  
  Default helpers are pre-trained and thus do not build their own codecs
  
  :param frequencies:
      dictionary of (token: frequency) pairs
  :param num_symbols:
      Number of BPE symbols. Recommend 30000-40000.  If <= 0, default
      30000 will be used.
  :param minfreq:
      Minimum frequency of a token before forced BPE decomposition. If <=
      0 will use subword-nmt default of 2.
  
  :return did_finalize:
      return whether codecs are finalized this call.
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code: def finalize(
      self, frequencies: Dict[str, int], num_symbols: int, minfreq: int
  ) -> bool:
      """
      Build the codecs.
  
      Default helpers are pre-trained and thus do not build their own codecs
  
      :param frequencies:
          dictionary of (token: frequency) pairs
      :param num_symbols:
          Number of BPE symbols. Recommend 30000-40000.  If <= 0, default
          30000 will be used.
      :param minfreq:
          Minimum frequency of a token before forced BPE decomposition. If <=
          0 will use subword-nmt default of 2.
  
      :return did_finalize:
          return whether codecs are finalized this call.
      """
      return False
  
imports: from parlai.core.params import ParlaiParser
  from abc import ABC, abstractmethod
  from functools import lru_cache
  import json
  import os
  import random
  import re
  from typing import Dict, List, Optional, Set, Tuple
  from typing_extensions import final
  from parlai.core.build_data import download, make_dir
  from parlai.core.opt import Opt
  from parlai.utils.misc import warn_once
  from parlai.utils.typing import TShared
  from parlai.utils.io import PathManager
  import parlai.utils.logging
label_desc: Use image node_id 10 for calling the BPEHelper obj's underlying member method code with example usage: obj.finalize(frequencies, num_symbols, minfreq) and returns: False