code: def _format_objective(objective):
      prefix, tag, _qual = objective
      if not prefix:
          return tag
      return f"{prefix}#{tag}"
  
imports: import logging
  import os
  import typing
  import warnings
  from guild import _skopt
  from guild import batch_util
  from guild import flag_util
  from guild import op_util
  from guild import query
label_desc: Use image node_id 23 for calling a global function with example usage: _format_objective(objective) and returns: prefix, str, tag, tag