code: def test_maximum(self):
      def z_func(x, y):
          return maximum(x, y)
  
      def k_func(x, y):
          return KK.maximum(x, y)
  
      self.compare_binary_op(
          k_func,
          Lambda(
              function=z_func,
          ),
          [[2, 3], [2, 3]],
      )
  
imports: import keras.backend
  import keras.layers
  import numpy
  import pytest
  from test.zoo.pipeline.utils.test_utils import ZooTestCase
  from zoo.pipeline.api.autograd import *
  import zoo.pipeline.api.autograd
  from zoo.pipeline.api.keras.layers import *
  from zoo.pipeline.api.keras.models import Sequential, Model
  from zoo.pipeline.api.utils import remove_batch
label_desc: Use image node_id 29 for calling the TestOperator obj's underlying member method code with example usage: obj.test_maximum() and returns: maximum, KK