code: def mean(self):
      inds = [
          Indicator(
              ind.key,
              ind.class_,
              ind.uuid,
              ind.props,
              select=ind.select,
              is_mean=True,
          )
          for ind in self._indicators
      ]
      return IndicatorCollection(inds)
  
imports: from enum import Enum
  from pathlib import Path
  from typing import List, Optional, Tuple, NamedTuple, Dict, Union
  from labml import lab
  from labml.internal import util
  from labml.internal.experiment.experiment_run import RunInfo
  from labml.internal.util.strings import is_pattern_match
label_desc: Use image node_id 9 for calling the IndicatorCollection obj's underlying member method code with example usage: obj.mean() and returns: IndicatorCollection