class_docstr: Chunks '__retrieved-docs__' into smaller docs (max 100 words each).
code: def add_cmdline_args(
      cls, parser: ParlaiParser, partial_opt: Optional[Opt] = None
  ) -> ParlaiParser:
      parser.add_argument(
          "--woi-doc-chunk-size",
          default=500,
          type=int,
          help="Document chunk size (in characters).",
      )
  
imports: import torch
  from parlai.core.mutators import register_mutator, MessageMutator, ManyEpisodeMutator
  from typing import Optional
  from parlai.core.opt import Opt
  from parlai.core.message import Message
  from parlai.core.params import ParlaiParser
  import parlai.tasks.wizard_of_internet.constants
  from parlai.tasks.wizard_of_wikipedia.mutators import AddLabel, AddLabelLM, CheckedSentenceAsLabel, AddCheckedSentence
label_desc: Use image node_id 1 for calling the WoiChunkRetrievedDocs obj's underlying member method code with example usage: obj.add_cmdline_args(cls, parser, partial_opt) without return types