class_docstr: Wrapper class for data config YAML
class_docstr_tok: ["Wrapper","class","for","data","config","YAML"]
docstr: Prepend target lang ID token as the target BOS.
docstr_tok: ["Prepend","target","lang","ID","token","as","the","target","BOS","."]
code: def prepend_tgt_lang_tag_as_bos(self) -> bool:
      """Prepend target lang ID token as the target BOS."""
      return self.config.get("prepend_tgt_lang_tag_as_bos", False)
  
imports: import logging
  from argparse import Namespace
  from copy import deepcopy
  from pathlib import Path
  from typing import Dict, Optional
  from fairseq.data import Dictionary
label_desc: Use image node_id 7 for calling the S2SDataConfig obj's underlying member method code with example usage: obj.prepend_tgt_lang_tag_as_bos() and returns: self