code: def testGraphInputTracingWorksWithConstAndPlaceholderTensors(
      self, tensor_debug_mode
  ):
      x = constant_op.constant(2.0)
      writer = dumping_callback.enable_dump_debug_info(
          self.dump_root, tensor_debug_mode=tensor_debug_mode
      )
  
      @def_function.function
      def func(x):
          return (x + constant_op.constant(4.0)) / x
  
      self.assertAllClose(self.evaluate(func(x)), 3.0)
      writer.FlushNonExecutionFiles()
      writer.FlushExecutionFiles()
  
      with debug_events_reader.DebugDataReader(
          self.dump_root
      ) as reader:
          reader.update()
          graph_op_digests = reader.graph_op_digests()
          placeholder_op_name = None
          const_op_name = None
          add_op_name = None
          div_op_name = None
          for op_digest in graph_op_digests:
              if op_digest.op_type == "Placeholder":
                  placeholder_op_name = op_digest.op_name
              elif op_digest.op_type == "Const":
                  const_op_name = op_digest.op_name
              elif op_digest.op_type == "AddV2":
                  add_op_name = op_digest.op_name
                  self.assertLen(op_digest.input_names, 2)
                  self.assertEqual(
                      op_digest.input_names[0],
                      placeholder_op_name + ":0",
                  )
                  self.assertEqual(
                      op_digest.input_names[1], const_op_name + ":0"
                  )
              elif op_digest.op_type == "RealDiv":
                  div_op_name = op_digest
                  self.assertLen(op_digest.input_names, 2)
                  self.assertEqual(
                      op_digest.input_names[0], add_op_name + ":0"
                  )
                  self.assertEqual(
                      op_digest.input_names[1],
                      placeholder_op_name + ":0",
                  )
          self.assertTrue(add_op_name)
          self.assertTrue(div_op_name)
  
imports: import collections
  import os
  import shutil
  import socket
  import tempfile
  import threading
  from absl.testing import parameterized
  import numpy
  from tensorflow.core.protobuf import debug_event_pb2
  from tensorflow.python.debug.lib import debug_events_reader
  from tensorflow.python.debug.lib import dumping_callback
  from tensorflow.python.debug.lib import dumping_callback_test_lib
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import googletest
  from tensorflow.python.platform import test
  from tensorflow.python.platform import tf_logging
label_desc: Use image node_id 29 for calling the DumpingCallbackTest obj's underlying member method code with example usage: obj.testGraphInputTracingWorksWithConstAndPlaceholderTensors(tensor_debug_mode) and returns: unknown