def collab_to_group_author_key_map(authors):
collab_map = {}<EOL>for author in authors:<EOL><INDENT>if author.get("<STR_LIT>"):<EOL><INDENT>collab_map[author.get("<STR_LIT>")] = author.get("<STR_LIT>")<EOL><DEDENT><DEDENT>return collab_map<EOL>
compile a map of author collab to group-author-key