code: def global_max(self, input_node):
      raise NotImplementedError
  
imports: from typing import Optional
  import tensorflow
  from tensorflow import nest
  from tensorflow.keras import layers
  from autokeras.engine import block
  from autokeras.utils import layer_utils
  from autokeras.utils import utils
label_desc: Use image node_id 3 for calling the Reduction obj's underlying member method code with example usage: obj.global_max(input_node) without return types