docs: def get_cfg_lbl(cfg, name=None, nonlbl_keys=INTERNAL_CFGKEYS, key_order=None,
                  with_name=True, default_cfg=None, sep=''):
      r"""
      Formats a flat configuration dict into a short string label. This is useful
      for re-creating command line strings.
  
      Args:
          cfg (dict):
          name (str): (default = None)
          nonlbl_keys (list): (default = INTERNAL_CFGKEYS)
  
      Returns:
          str: cfg_lbl
  
      CommandLine:
          python -m utool.util_gridsearch get_cfg_lbl
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_gridsearch import *  # NOQA
          >>> import utool as ut
          >>> cfg = {'_cfgname': 'test', 'var1': 'val1', 'var2': 'val2'}
          >>> name = None
          >>> nonlbl_keys = ['_cfgstr', '_cfgname', '_cfgtype', '_cfgindex']
          >>> cfg_lbl = get_cfg_lbl(cfg, name, nonlbl_keys)
          >>> result = ('cfg_lbl = %s' % (six.text_type(cfg_lbl),))
          >>> print(result)
          cfg_lbl = test:var1=val1,var2=val2
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_gridsearch import *  # NOQA
          >>> import utool as ut
          >>> cfg = {'var1': 'val1', 'var2': 'val2'}
          >>> default_cfg = {'var2': 'val1', 'var1': 'val1'}
          >>> name = None
          >>> cfg_lbl = get_cfg_lbl(cfg, name, default_cfg=default_cfg)
          >>> result = ('cfg_lbl = %s' % (six.text_type(cfg_lbl),))
          >>> print(result)
          cfg_lbl = :var2=val2
  
      Example:
          >>> # ENABLE_DOCTEST
          >>> from utool.util_gridsearch import *  # NOQA
          >>> import utool as ut
          >>> cfg = {'_cfgname': 'test:K=[1,2,3]', 'K': '1'}
          >>> name = None
          >>> nonlbl_keys = ['_cfgstr', '_cfgname', '_cfgtype', '_cfgindex']
          >>> cfg_lbl = get_cfg_lbl(cfg, name, nonlbl_keys)
          >>> result = ('cfg_lbl = %s' % (six.text_type(cfg_lbl),))
          >>> print(result)
          cfg_lbl = test:K=1
      """
      import utool as ut
      if name is None:
          name = cfg.get('_cfgname', '')
  
      if default_cfg is not None:
          # Remove defaulted labels
          cfg = ut.partition_varied_cfg_list([cfg], default_cfg)[1][0]
  
      # remove keys that should not belong to the label
      _clean_cfg = ut.delete_keys(cfg.copy(), nonlbl_keys)
      _lbl = ut.repr4(_clean_cfg, explicit=True, nl=False, strvals=True,
                         key_order=key_order, itemsep=sep)
      # _search = ['dict(', ')', ' ']
      _search = ['dict(', ')']
      _repl = [''] * len(_search)
      _lbl = ut.multi_replace(_lbl, _search, _repl).rstrip(',')
      if not with_name:
          return _lbl
      if NAMEVARSEP in name:
          # hack for when name contains a little bit of the _lbl
          # VERY HACKY TO PARSE OUT PARTS OF THE GIVEN NAME.
          hacked_name, _cfgstr, _ = parse_cfgstr_name_options(name)
          _cfgstr_options_list = re.split(
              r',\s*' + ut.negative_lookahead(r'[^\[\]]*\]'), _cfgstr)
          #cfgstr_options_list = cfgopt_strs.split(',')
          _cfg_options = ut.parse_cfgstr_list(
              _cfgstr_options_list, smartcast=False, oldmode=False)
          #
          ut.delete_keys(_cfg_options, cfg.keys())
          _preflbl = ut.repr4(_cfg_options, explicit=True, nl=False, strvals=True)
          _preflbl = ut.multi_replace(_preflbl, _search, _repl).rstrip(',')
          hacked_name += NAMEVARSEP + _preflbl
          ###
          cfg_lbl = hacked_name + _lbl
      else:
          cfg_lbl = name + NAMEVARSEP + _lbl
      return cfg_lbl