code: def select_authors_by_epithet(query):
      """Pass exact name (case insensitive) of epithet name, return ordered set
      of author ids.
      """
  
      for epithet, ids in AUTHOR_EPITHET.items():
          if epithet.casefold() == query.casefold():
              return set(ids)
  
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 4 for calling a global function with example usage: select_authors_by_epithet(query) and returns: set