code: def testOptimizeForInference(self):
      self.maxDiff = 1000
      unused_constant_name = "unused_constant"
      unconnected_add_name = "unconnected_add"
      a_constant_name = "a_constant"
      b_constant_name = "b_constant"
      a_check_name = "a_check"
      b_check_name = "b_check"
      a_identity_name = "a_identity"
      b_identity_name = "b_identity"
      add_name = "add"
      unused_output_add_name = "unused_output_add"
      graph_def = graph_pb2.GraphDef()
      unused_constant = self.create_constant_node_def(
          unused_constant_name, value=0, dtype=dtypes.float32, shape=[]
      )
      graph_def.node.extend([unused_constant])
      unconnected_add_node = self.create_node_def(
          "Add",
          unconnected_add_name,
          [unused_constant_name, unused_constant_name],
      )
      self.set_attr_dtype(unconnected_add_node, "T", dtypes.float32)
      graph_def.node.extend([unconnected_add_node])
      a_constant = self.create_constant_node_def(
          a_constant_name, value=1, dtype=dtypes.float32, shape=[]
      )
      graph_def.node.extend([a_constant])
      a_check_node = self.create_node_def(
          "CheckNumerics", a_check_name, [a_constant_name]
      )
      graph_def.node.extend([a_check_node])
      a_identity_node = self.create_node_def(
          "Identity",
          a_identity_name,
          [a_constant_name, "^" + a_check_name],
      )
      graph_def.node.extend([a_identity_node])
      b_constant = self.create_constant_node_def(
          b_constant_name, value=1, dtype=dtypes.float32, shape=[]
      )
      graph_def.node.extend([b_constant])
      b_check_node = self.create_node_def(
          "CheckNumerics", b_check_name, [b_constant_name]
      )
      graph_def.node.extend([b_check_node])
      b_identity_node = self.create_node_def(
          "Identity",
          b_identity_name,
          [b_constant_name, "^" + b_check_name],
      )
      graph_def.node.extend([b_identity_node])
      add_node = self.create_node_def(
          "Add", add_name, [a_identity_name, b_identity_name]
      )
      self.set_attr_dtype(add_node, "T", dtypes.float32)
      graph_def.node.extend([add_node])
      unused_output_add_node = self.create_node_def(
          "Add", unused_output_add_name, [add_name, b_constant_name]
      )
      self.set_attr_dtype(unused_output_add_node, "T", dtypes.float32)
      graph_def.node.extend([unused_output_add_node])
  
      expected_output = graph_pb2.GraphDef()
      a_constant = self.create_constant_node_def(
          a_constant_name, value=1, dtype=dtypes.float32, shape=[]
      )
      expected_output.node.extend([a_constant])
      b_constant = self.create_constant_node_def(
          b_constant_name, value=1, dtype=dtypes.float32, shape=[]
      )
      expected_output.node.extend([b_constant])
      add_node = self.create_node_def(
          "Add", add_name, [a_constant_name, b_constant_name]
      )
      self.set_attr_dtype(add_node, "T", dtypes.float32)
      expected_output.node.extend([add_node])
  
      output = optimize_for_inference_lib.optimize_for_inference(
          graph_def, [], [add_name], dtypes.float32.as_datatype_enum
      )
      self.assertProtoEquals(expected_output, output)
  
imports: import numpy
  from tensorflow.core.framework import attr_value_pb2
  from tensorflow.core.framework import graph_pb2
  from tensorflow.core.framework import node_def_pb2
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import importer
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor_util
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_nn_ops
  from tensorflow.python.ops import image_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.platform import test
  from tensorflow.python.tools import optimize_for_inference_lib
label_desc: Use image node_id 5 for calling the OptimizeForInferenceTest obj's underlying member method code with example usage: obj.testOptimizeForInference() without return types