code: def _ensure_scalars(self):
      if self._scalars is None:
          self._scalars = list(self._index.run_scalars(self._run))
      return self._scalars
  
file_path: guildai/guild/filter_util.py
imports: from guild import filter
  from guild import index
  from guild import var
label_desc: Use image node_id 5 for calling the _FilterRun obj's underlying member method code with example usage: obj._ensure_scalars() and returns: self