code: def set_default_configs(self):
      self.config = {"input": "[-1]", "dim": -1}
  
imports: from __future__ import print_function
  from __future__ import division
  import math
  import re
  import sys
  from libs.nnet3.xconfig.basic_layers import XconfigLayerBase
label_desc: Use image node_id 2 for calling the ChannelAverageLayer obj's underlying member method code with example usage: obj.set_default_configs() without return types