code: def _joined_resdef_source_desc(resdef):
      return ",".join(
          [source.resolving_name for source in resdef.sources]
      )
  
imports: import collections
  import copy
  import logging
  import operator
  import pprint
  from guild import util
label_desc: Use image node_id 3 for calling a global function with example usage: _joined_resdef_source_desc(resdef) and returns: str