code: def get_date_author():
      """Returns entirety of date-author index."""
      _path = os.path.join(THIS_DIR, "author_date.json")
      return open_json(_path)
  
imports: import json
  import os
  import regex
  from cltk.corpora.grc.tlg.author_date import AUTHOR_DATE
  from cltk.corpora.grc.tlg.author_epithet import AUTHOR_EPITHET
  from cltk.corpora.grc.tlg.author_female import AUTHOR_FEMALE
  from cltk.corpora.grc.tlg.author_geo import AUTHOR_GEO
  from cltk.corpora.grc.tlg.id_author import ID_AUTHOR
  from cltk.corpora.grc.tlg.index_lists import INDEX_LIST
  from cltk.corpora.grc.tlg.work_numbers import WORK_NUMBERS
label_desc: Use image node_id 16 for calling a global function with example usage: get_date_author() and returns: open_json